Answer
A cookie stores small data in the user’s browser for preferences or authentication.
Quick Answer
Cookies store small data in the browser sent with every request to the domain. setcookie("name", "value", expiry, path, domain, secure, httponly). Accessible via $_COOKIE["name"]. Persist across browser sessions (based on expiry). Less secure than sessions (data on client). Use for: remember me functionality, user preferences, tracking. Set HttpOnly=true (prevents JS access) and Secure=true (HTTPS only).
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ