Networking & Protocols
What is a cookie
Cookies are small text files stored on a user's machine by a web browser, enabling websites to maintain state across multiple requests. They are a core mechanism for session management, personalization, and tracking, but introduce security and performance considerations.
HTTP protocolSet-Cookie headerCookie headerSession cookiesPersistent cookiesXSS vulnerabilityHttpOnly flagSecure flagSameSite cookiesLocal storage
Practice this topic with AI
Get coached through this concept in a mock interview setting

What is a cookie - System Design Diagram
Ready to practice?
Our AI coach will quiz you on this topic and give real-time feedback
Practice This Topic