What does it mean to stake CRO in crypto.com?

There are different forms of staking CRO:

1. Staking for CRO Card - when you stake CRO coins to obtain the card, the card will bring you benefits such as cashback (earned in the form of CRO) etc.
2. Stake & Earn - when you stake CRO to earn, you will earn interest paid out in the form of CRO coins. The interest changes based on how many CRO you stake and the duration of the staking.

I would assume your question on staking is pertaining to unlocking the free 25USD (or 50USD, depending on when you sign up). Ultimately its dependent on whether you feel the card is beneficial towards you because as what WenBin accurately point out, you cannot withdraw the staked CRO for 6 months.

You buy the cro coins and cannot withdraw it for the set duration