A deposit in trading contexts refers to funds placed with a broker or clearinghouse to secure trading positions and meet margin requirements. Initial deposits are required to open leveraged positions, while maintenance deposits ensure ongoing position coverage. These deposits protect against potential losses and maintain market integrity.

Deposit requirements vary by instrument type, volatility levels, and regulatory requirements. Futures trading requires initial and maintenance margins, while forex trading uses different deposit structures. Deposits may earn interest but are primarily risk management tools rather than investments. Insufficient deposits can trigger margin calls or position liquidation.

Real-world example: A trader deposits $10,000 with a futures broker to meet initial margin requirements for trading crude oil contracts, with additional deposits required if positions move against them.