A swap, also known as a rollover charge, is the interest you pay or earn for a trade that you keep open overnight. It is usually the interest rate differential between the two currencies in the currency pair being traded, and it is determined based on whether your position is long or short.
CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. 74.29% of retail investor accounts lose money when trading CFDs with Credit Financier Invest (CFI) Ltd. You should consider whether you understand how CFDs work and whether you can afford to take the risk of losing your money.