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An attorney at law (or attorney-at-law) in the United States is a practitioner in a court of law who is legally qualified to prosecute and defend actions in such court on the retainer of clients. Alternative terms include counselor (or counsellor-at-law) and lawyer.  As of April 2011, there were 1,225,452 licensed attorneys in the United States.  A 2012 survey conducted by LexisNexis Martindale-Hubbell determined 58 million consumers in the U.S. sought an attorney in the last year and that 76 percent of consumers used the Internet to search for an attorney. 
The United States legal system does not draw a distinction between lawyers who plead in court and those who do not, unlike many other common law jurisdictions. For example, jurisdictions in the United Kingdom distinguish between solicitors who do not plead in court, and the barristers of the English and Welsh systems and advocates of the Scottish system, who do plead in court. Likewise, civil law jurisdictions distinguish between advocates and civil law notaries. An additional factor that differentiates the American legal system from other countries is that there is no delegation of routine work to notaries public.
Many American attorneys limit their practices to specialized fields of law.  Often dichotomies are drawn between different types of attorneys, but, with the exception of patent law practice, these are neither fixed nor formal lines. Examples include:
- Outside counsel (law firms) v. in-house counsel (corporate legal department)
- Plaintiff v. defense attorneys (some attorneys do both plaintiff and defense work, others only handle certain types of cases like personal injury, business etc.)
- Transactional (or "office practice") attorneys (who negotiate and draft documents and advise clients, rarely going to court) v. litigators (who advise clients in the context of legal disputes both in and out of court, including lawsuits, arbitrations and negotiated settlements)
- Trial attorneys (who argue the facts, such as the late Johnnie Cochran) v. appellate attorneys (who argue the law, such as David Boies)
Despite these descriptions, some states forbid or discourage claims of specialization in particular areas of law unless the attorney has been certified by his or her state bar  or state board of legal specialization.
Some states grant formal certifications recognizing specialties. In California, for example, bar certification is offered in family law, appellate practice, criminal law, bankruptcy, estate planning, immigration, taxation and workers' compensation. Any attorney meeting the bar requirements in one of these fields may represent himself as a specialist. The State Bar of Texas, for example, formally grants certification of specialization in 21 select areas of law. 
The majority of lawyers practicing in a particular field may typically not be certified as specialists in that field (and state board certification is not generally required to practice law in any field). For example, the State Bar of Texas (as of mid-2006) reported 77,056 persons licensed as attorneys in that state (excluding inactive members of the Bar),  while the Texas Board of Legal Specialization reported, at about the same time, only 8,303 Texas attorneys who were board certified in any specialty.  Indeed, of the 8,303 certified specialists in Texas, the highest number of attorneys certified in one specific field at that time was 1,775 (in personal injury trial law).
Specialization in patent law is administered by the Office of Enrollment and Discipline of the US Patent and Trademark Office, which imposes stringent requirements for applicants to become registered as patent attorneys or patent agents.[ citation needed]
In the United States, the practice of law is conditioned upon admission to practice of law, and specifically admission to the bar of a particular state or other territorial jurisdiction. Regulation of the practice of law is left to the individual states, and their definitions vary.  Arguing cases in the federal courts requires separate admission.[ citation needed]
Each US state and similar jurisdiction (e.g. territories under federal control) sets its own rules for bar admission (or privilege to practice law), which can lead to different admission standards among states. In most cases, a person who is "admitted" to the bar is thereby a "member" of the particular bar.
In the canonical case, lawyers seeking admission must earn a Juris Doctor degree from a law school approved by the jurisdiction, and then pass a bar exam administered by it. Typically, there is also a character and fitness evaluation, which includes a background check. However, there are exceptions to each of these requirements.
A lawyer who is admitted in one state is not automatically allowed to practice in any other. Some states have reciprocal agreements that allow attorneys from other states to practice without sitting for another full bar exam; such agreements differ significantly among the states.
In 1763, Delaware created the first bar exam with other American colonies soon following suit. 
The bar examination in most U.S. states and territories is at least two days long (a few states have three-day exams).  It consists of essay questions, usually testing knowledge of the state's own law (usually subjects such as wills, trusts and community property, which always vary from one state to another). Some jurisdictions choose to use the Multistate Essay Examination (MEE), drafted by the NCBE since 1988, for this purpose. Others may draft their own questions with this goal in mind, while some states both draft their own questions and use the MEE. Some jurisdictions administer complicated questions that specifically test knowledge of that state's law.
Bar exams also usually consist of the Multistate Bar Examination, which is a multiple-choice standardized test created and sold to participating state bar examiners by the National Conference of Bar Examiners since 1972.  The MBE contains 200 questions which test six subjects based upon principles of common law and Article 2 of the Uniform Commercial Code.
The State of Washington has a separate Law Clerk program under Rule Six of the Washington Court Admission to Practice Rules.  A college graduate of good moral character may be accepted into the four-year Rule Six Law Clerk Program, obtain employment in a law firm or with a judge for at least 30 hours a week and study a prescribed Course of Study under a tutor. After successful completion of the program, a law clerk may take the Washington State Bar Exam and, upon passing, will be admitted as an attorney into the Washington State Bar Association.
The degree earned by prospective attorneys in the United States is generally a Juris Doctor (Latin for "Doctor of Jurisprudence"; abbreviated J.D. or, when conferred in English, D.Jur.).  This is different from countries based on a British law system, where law is taught at the undergraduate level, resulting in a Bachelor of Laws being awarded.[ citation needed] The Doctor of Laws exists in the United States as an honorary degree.[ citation needed]
The highest law degrees obtainable in the United States are Doctor of Juridical Science (Scientiae Juridicae Doctor, abbreviated S.J.D. or J.S.D.) and a Masters of Laws ("Magister Legum", abbreviated "LL.M.".[ citation needed] The S.J.D. is akin to an academic degree that, like the Ph.D., is research-based and requires a dissertation (an original contribution to the academic study of law). The LL.M. is generally earned by completing studies in a particular area of law. For example, most accredited law schools in the United States require basic coursework in Federal Taxation. After earning a J.D., an attorney may seek admission to an LL.M. program in taxation. Earning the LL.M. requires completion of coursework in the area of tax law. There is no requirement for attorneys to complete an LL.M. program to practice law in the United States, and relatively few attorneys hold an LL.M.
Some courts allow law students to act as "certified student attorneys" after the satisfactory completion of their first year of law school and the completion of particular second- and third-year courses with subjects such as evidence.[ citation needed]
Many states allow students to argue in front of a court as a certified legal intern (CLI), provided they meet certain prerequisites, such as having completed at least half of their law education, having taken or be taking the law school's ethics class and being under the supervision of a qualified and licensed attorney.[ citation needed]
Some states provide criminal penalties for falsely holding oneself out to the public as an attorney at law and the unauthorized practice of law by a non-attorney.[ citation needed]
A person who has a professional law degree, but is not admitted to a state bar is not an attorney at law but may be considered a lawyer (one learned in the law, according to Black's Law Dictionary) since he or she does not hold a license issued by a state.[ citation needed]
A few areas of law, such as patent law, bankruptcy, or immigration law, are mandated by the U.S. Constitution to be strictly under federal jurisdiction. In this case, state courts and bar associations are not allowed to restrict the practice of that field of law.[ citation needed]
- Merriam-Webster Online
- "ABA Market Research Department" (PDF). Market Research Department. American Bar Association. April 2011. Retrieved 2012-10-04.
- "How Consumers Choose an Attorney: Information Gathering". The National Law Review. Stephen Fairley. 2012-09-27. Retrieved 2012-10-01.
- Munneke, Gary. "Why Specialize?". American Bar Association. Archived from the original on 2016-03-22. Retrieved 2 July 2015.
- "Standing Committee on Specialization | Standing Committee / Specialization". Abanet.org. 2012-03-05. Retrieved 2012-10-06.
- Texas Board of Legal Specialization (TBLS)
- See factsheet entitled "State Bar of Texas Facts," from texasbar.com.
- "TBLS FAQs". Archived from the original on 2006-08-13. Retrieved 2006-09-22.
- "State Definitions of the Practice of Law" (PDF). American Bar Association. Retrieved April 29, 2011.
- California Bar Background information, accessed April 21, 2009 Archived May 10, 2009, at the Wayback Machine.
- William Burnham, Introduction to the Law and Legal System of the United States, 4th ed. (St. Paul: Thomson West, 2006), 135.
- Bar Admissions background, PDF Archived October 10, 2008, at the Wayback Machine.
- Washington Courts: APR Rule 6, Law Clerk Program
- "Juris Doctor". TheFreeDictionary.com. Farlex. 2008. Retrieved 2 April 2015.