Devolution is the practice of delegating legislative powers from the national legislature to regional legislatures.
The aim of devolution is to give regions more autonomy when it comes to creating and amending legislation which applies locally.
Scottish devolution formally began with the passage of the Scotland Act 1998 which created the Scottish Parliament and the Scottish Executive (renamed the Scottish Government in 2012).
Welsh devolution formally began with the Government of Wales Act 1998 which created the Welsh National Assembly (renamed the Welsh Parliament in 2020), with limited legislative powers. The Government of Wales Act 2006 increased the legislative powers of the Assembly and created the Welsh Government.