What's the difference between locked, flexible and defi staking for crypto in binance?

Locked - doesn't allow you to move funds for 30, 60 or 90 days although there is a redeem earlier option.

flexible - slighly shorter term like 7 days with auto stake option if turn it on.

defi - projects that are on Binance, you are rewarded for staking in the project this is generally 30 days term with option to terminate early.