What is Cookie?
A cookie is a small piece of data a server asks a browser to store and automatically resend with every subsequent request to that domain. Cookies are how stateless HTTP gets state — sessions, login persistence, and preferences — layered on top, and their Secure, HttpOnly, and SameSite attributes control how safely they are transmitted and accessed.
Example
Set-Cookie: session=abc123; HttpOnly; Secure; SameSite=Strict
Related tool
Try it on ToolSphere — runs entirely in your browser, nothing is uploaded to a server.