Simply put, an NFT wallet/crypto wallet is a software that allows you to store, send, and receive NFTs/cryptocurrencies. You can think of your wallet as a digital 'vault' where you can store your valuables, and only you can access this vault via email/password, seed phrase, login codes, etc. The difference between an actual vault and an NFT wallet is that, in addition to storing your valuables, you can exchange the items in your wallet/interact with other wallets via 'smart contracts' on the blockchain.