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A Jewish day school is a modern Jewish educational institution that is designed to provide children of Jewish parents with both a Jewish  and a secular education in one school on a full-time basis. The term " day school"  is used to differentiate schools attended during the day from their secular or religious "boarding school" equivalents where the students live full-time as well as study. The substance of the "Jewish" component varies from school to school, community to community, and usually depends on the Jewish denominations of the schools' founders. While some schools may stress Judaism and Torah study others may focus more on Jewish history, Hebrew language, Yiddish language, secular Jewish culture, and Zionism.
Day schools   were established in great numbers after World War II in the United States and in other Western countries such as Canada, England, South Africa, Australia, and in South America. In the United States the dislike for, and decline of, the old-fashioned Talmud Torahs and a disenchantment with public schools led to a push for the formation of full-time all-day dual- curriculum schools.
The afternoon/Talmud Torah system was deemed "failing to transmit Yiddishkeit in a compelling manner to students who arrived tired in the afternoons and were constantly subjected to assimilationist influences in American culture." 
Not all Jewish day schools are the same. While they may all teach Jewish studies or various parts of Torah and Tanakh, these studies may be taught from various points of view depending on each school's educational policies, the board of directors in charge, and the nature and make-up of both the student body and the professional teaching staff.
Some day schools may be entirely religious, and indeed most yeshivas ( Orthodox schools that emphasize Talmudic studies) are day schools. However, the traditional yeshivas are different institutions when compared to Modern Orthodox Jewish day schools. While traditional Haredi and Hasidic yeshivas are only for boys, with girls attending Beis Yaakov schools, they do not encourage their students to plan for college education and professional careers. On the other hand, Modern Orthodox day schools are usually coeducational and stress the secular component of the curriculum, precisely because many parents wish to have their children educated at a high enough level to be admitted to the finest colleges and universities in order to train for a profession.
The Solomon Schechter Day Schools in the United States and Canada teach Judaism from the perspective of Conservative Judaism, and there are schools that similarly teach Judaism from a Reform or even non-denominational perspective. These latter are usually called pluralist day schools, and many belong to RAVSAK, a network of pluralist day schools.
Jewish day schools may be entirely secular. One of the largest day schools in the world is the King David School system in Johannesburg, South Africa that educated thousands of Jewish students, stressing the teaching of Hebrew language and Zionism, with a modicum of Judaism, since the majority of students and the teachers are not fully religiously observant.
In all Jewish day schools, students are taught to read, speak, and understand the language of Hebrew—the ancient language of the Jews. Usually beginning in grade school, students have intensive Hebrew studies. This is challenging for many students, since Hebrew uses different letters and a different script than English, French, and other languages that use the Latin alphabet. 
There were 861 Jewish day schools in USA in 2013-2014, with an enrollment of 255,000 children from age 4 to grade 12. 
- Hebrew school
- Jewish education
- Private school
- Religious education
- Religious school
- Talmud Torah
- SHARON OTTERMAN (February 19, 2015). "City Eases Pre-K Rules to Allow Prayer Breaks". The New York Times.
- "Day school definition, a school open for instruction on weekdays only, usually from 9 a.m. until 3 p.m. "Day school - dictionary.com".
- "National Society For Hebrew Day Schools".
- Daniel Judah Elazar (1995). Community and Polity: The Organizational Dynamics of American Jewry
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- Dovid Sussman (March 16, 2011). "In the Land of No, He Said YES".
- "Founded in 1969. The Day School is one of the best preschools in the ... area." "Preschool, Mothers Morning Out - The Day School".
- "It was graduation day for the Steppingstone Day School in Kew Gardens, Queens, and the 5-year-olds in their little white gowns and mortarboards ..." Michael T. Kaufman (June 23, 1993). "A Graduation Ceremony Earns Special Cheers". The New York Times.
- "This Day In History 18 Sivan/June 24". HaModia. June 23, 2016.
- Ancient Scripts.
- AVI CHAI Census of Jewish Day Schools in the United States - 2013-14
- The Chabad Sociologist. (2013). "Comparing Full Time and Part Time Numbers at Chabad Schools". Chabadsociologist.wordpress.com. http://chabadsociologist.wordpress.com/2013/08/06/comparing-full-time-and-part-time-numbers-at-chabad-schools/.