"Education at a Glance" is the authoritative source for information on the state of education around the world. It provides data on the structure, finances and performance of education systems across OECD countries and a number of partner economies. More than 100 charts and tables in this publication -- as well as links to much more available on the educational database -- provide key information on the output of educational institutions; the impact of learning across countries; access, participation and progression in education; the financial resources invested in education; and teachers, the learning environment and the organisation of schools. The 2020 edition includes a focus on vocational education and training, investigating participation in vocational education and training at various levels of education, the labour market and social outcomes of vocational graduates as well as the human and financial resources invested in vocational institutions. Two new indicators on how vocational education and training systems differ around the world and on upper secondary completion rate complement this topic. A specific chapter is dedicated to the Sustainable Development Goal 4, and investigates the quality and participation in secondary education. [This edition was revised April 2021. For "Education at a Glance 2019: OECD Indicators," see ED615321.]