The primary source of federal aid for elementary and secondary education is the Elementary and Secondary Education Act (ESEA)--particularly its Title I-A program, which authorizes federal aid for the education of disadvantaged students. This report provides an overview of major provisions of the ESEA. It also includes a table showing annual appropriations for ESEA programs for FY2017 through FY2020, as well as a table showing the transition in authorized programs and related appropriations from FY2016, when the No Child Left Behind Act of 2001 (NCLB; P.L. 107-110) provisions were still in effect, to FY2017, when ESSA provisions took effect. Finally, a table detailing authorizations of appropriations under current law is also included. The ESSA authorized appropriations for ESEA programs through FY2020.