# Website Cookies
**Source:** https://glossary.keenfunnel.com/terms/website-cookies
**Language:** French

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## Explication technique

Servers set cookies through Set-Cookie; browsers return matching values in Cookie according to domain, path, expiry, Secure, HttpOnly, SameSite, and other rules. Cookies may support sessions, preferences, security, analytics, or advertising and may be first-party or third-party by context.

## Pertinence commerciale

Cookies enable essential session and personalisation functions and can support measurement, but their use affects privacy, consent, security, vendor governance, and analytics reliability.

## Exemple d'implémentation

An application stores a random session identifier in a Secure, HttpOnly, SameSite cookie, keeps sensitive account data server-side, rotates the identifier after login, and applies consent controls to non-essential analytics cookies.

## Limites et idées reçues courantes

Cookies can be stolen, leaked, blocked, deleted, or used for intrusive tracking. They have size and scope limits, cross-site availability is declining, and consent does not replace data minimisation or secure design.

## Sujets

Architecture des systèmes Cybersécurité Publicité à la performance Ingénierie des données

## Sources

IETF RFC 6265 — HTTP State Management Mechanism — OWASP — Session Management Cheat Sheet — https://cheatsheetseries.owasp.org/cheatsheets/Session\_Management\_Cheat\_Sheet.html

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