Glossary term
What is Cookie? Meaning for developers
Small data the browser sends with each request to a site. Example: sid=k9Fq…; HttpOnly; Secure; SameSite=Lax.
Learn it properly · System DesignLesson 49: Authentication vs Authorization: Sessions, Cookies & JWTEvery endpoint checked “is the user logged in?” — and changing one number in the URL showed another customer's invoice. Authentication vs authorization, storing passwords, MFA and passkeys, sessions vs JWTs (with a live token to tamper with), and RBAC, ABAC and ReBAC.