A school library (or a school library media center) is a library within a school where students, staff, and often, parents of a public or private school have access to a variety of resources. The goal of the school library media center is to ensure that all members of the school community have equitable access "to books and reading, to information, and to information technology." A school library media center "uses all types of media... is automated, and utilizes the Internet [as well as books] for information gathering." School libraries are distinct from public libraries because they serve as "learner-oriented laboratories which support, extend, and individualize the school's curriculum... A school library serves as the center and coordinating agency for all material used in the school."
Researchers have demonstrated that school libraries have a positive impact on student achievement through the more than 60 studies that have been conducted in 19 U.S. states and one Canadian province. The major finding of these studies was that students with access to a well-supported school library media program with a qualified school library media specialist, scored higher on reading assessments regardless of their socio-economic statuses. In addition, a study conducted in Ohio revealed that 99.4% of students surveyed believed that their school librarians and school library media programs helped them succeed in school. A report that reported similar conclusions was compiled by Michele Lonsdale in Australia in 2013.
The later part of the 19th century marked the beginning of the modern American library movement with the creation of the American Library Association (ALA) in 1876 by a group of librarians led by Melvil Dewey. At these beginning stages of development, the school libraries were primarily made up of small collections with the school librarian playing primarily a clerical role.
Dewey wrote that "a broad conception at the end of the century of the work of the schools is simply this, to teach the children to think accurately, with strength and with speed. If it is in the school that they get their start, then where do they get their education?"
1920 marked the first effort by the library and education communities to evaluate school libraries with the publication of the Certain Report, which provided the first yardstick for evaluating school libraries.
School libraries experienced another major push following the launch of Sputnik in 1957, which forced the United States to re-evaluate its priorities for math and science education. As a result, the 1960s were one of the greatest periods of growth and development for school libraries due to an increased flow of money and support from the private sector and public funding for education. Most notable during this time was the Knapp School Libraries Project which established model school library media centers across the country. Hundreds of new school libraries were expanded and renovated during this time.