This Practice Note provides an introduction to the public sector equality duty (PSED) under the Equality Act 2010 and its role in the day-to-day business of public authorities and bodies. It highlights the key aims of the duty and breaks down relevant definitions such as ‘relevant protected characteristic’. Highlighting the scope and application of the PSED, this Practice Note provides references to case law and guidance to illustrate key considerations for delivering the different aims. It also discusses the processes for assessment under the PSED and the role and involvement of the Equality and Human Rights Commission.