ZkLogin is a way to use Sui with your online accounts, such as Google or Facebook. It lets you send transactions from a Sui address that is linked to your account, but you can only see the link. You can log in with your account and approve the transaction, without needing a crypto wallet or a password.

ZkLogin is important for Web3 users because it offers several benefits:

• It is easy to use: You can join the Web3 world with your existing Web2 accounts and use DApps on Sui without any hassle.
• It is safe: You have full control over your funds and data, and no one can transact on your behalf without your permission.
• It is secure: You are protected from hackers, as sending a transaction requires both a recent login and a secret salt that is not stored by the online service.
• It is private: You can keep your identity hidden, as no one can link your Sui address with your account unless you choose to reveal it.