Cookies are stored on the client side (i.e., in the user's browser) and are primarily used to store small amounts of data that need to persist between multiple requests. Sessions, on the other hand, are stored on the server side and are used to store and manage user-specific data during a user's visit to a website.
The key difference between sessions and cookies is that sessions are saved on the server side while cookies are saved on the client side. Cookies are small text files used to store user information on the user's computer. Sessions are used to store user information on the user's server side.