This Practice Note gives an introduction to repo (repurchase transactions) and the Global Master Repurchase Agreement (GMRA), the most commonly used agreement in the UK and EU repo markets. It looks at (1) why parties use repo, (2) payment and delivery obligations, (3) key legal issues which arise with repos, (4) the difference between repo and securities lending, (5) the general structure of the market documentation, (6) benefits of using the GMRA, (7) key provisions under the GMRA, (8) clearing and automatic trading, (9) repo and the Financial Collateral Arrangements (No.2) Regulations 2003, and (10) in brief, the Securities Financing Transactions Regulation.