To implement sign-out functionality in your React application using Clerk, you can use the SignOutButton component provided by Clerk. This component handles the sign-out process for you, ensuring that the user's session is properly terminated both in the browser and on Clerk's backend. You can place the SignOutButton anywhere in your app where you want to offer users the ability to log out, such as in a navigation bar or a user profile menu. When clicked, the button will automatically end the user's session and redirect them according to your Clerk configuration.

Managing user sessions is a critical part of secure authentication. Clerk automatically creates a session when a user signs in, and this session persists until it expires, is signed out, or is revoked. Session expiration is determined by Clerk's configuration, which typically sets a time limit for how long a session is valid. When a session expires, the user is automatically signed out and must sign in again to continue using protected parts of your app.

Clerk also supports session renewal, allowing users to maintain their session without frequent interruptions. If a session is about to expire, Clerk can prompt the user to re-authenticate or can silently renew the session if configured to do so. In your React app, you should listen for session state changes to keep your UI in sync with the user's authentication status. For example, if the session expires or the user signs out, you might want to redirect them to a sign-in page or display a message indicating that their session has ended. React hooks provided by Clerk make it easy to monitor these changes and update your app's state accordingly.