Authentication is how an app confirms a user is who they say they are, usually with a login step like email and password. It's what lets an app have user accounts and keep each person's data to themselves.
Authentication
How authentication works
When someone signs in, the app checks their credentials, such as an email and password, against what it has on record, and only grants access if they match. Once verified, the app knows who the user is for the rest of their session, so it can show them their own data and keep others out. On Emergent, you don't wire this up by hand: you describe the login you want in plain language and the agent builds the authentication system for you.
Examples
You ask Emergent to add email-and-password login to a client portal, and it builds the sign-up and sign-in flow so each client sees only their own projects. In an app with user accounts, authentication is what keeps one person's dashboard private from everyone else's.
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