A public key is a critical component of a crypto wallet because it is used to receive funds from other users on the network.
In a crypto wallet, each user has a pair of keys: a public key and a private key. The public key is a cryptographic code that is visible to anyone on the network, while the private key is kept secret and known only to the wallet owner. The public key acts like an address or a bank account number that can be used by other users to send funds to the wallet.