Cookie

Small data the browser stores and sends back to the same site on every request.

What is Cookie?

A cookie is a small piece of data the server asks the browser to store and send back with every later request to that site. HttpOnly cookies can't be read by JavaScript, which protects session tokens.

Set-Cookie: session=abc123; HttpOnly; Secure; SameSite=Lax; Path=/

Level: Journeyman · More Web Development terms at this level

Updated September 27, 2026