SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-first-third-party-cookies

How do first-party and third-party cookies differ?

The visited site makes first-party cookies; other sites make third-party ones.

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  1. They always contain passwords
  2. They come from different sites ✔
  3. Only one kind works on phones

Why: A first-party cookie comes from the site you are visiting and may remember preferences. A third-party cookie comes from another site, often an advertising service.

Huh, didn't know that: Unlike a first-party cookie, a third-party cookie can track you across many sites.

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Browser cookies have no crumbs, but they still leave a trail.
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References

Answer: They come from different sites. A first-party cookie comes from the site you are visiting and may remember preferences. A third-party cookie comes from another site, often an advertising service.

  1. MDN: Third-party cookies developer.mozilla.org/en-US/docs/Web/Privacy/Guides/Third-party_cookies
    If the cookie domain and scheme match the current page the user is looking at, the cookie is considered to be from the same site
    Checked 2026-10-10.
  2. MDN: Third-party cookies developer.mozilla.org/en-US/docs/Web/Privacy/Guides/Third-party_cookies
    If the domain and scheme are different, the cookie is not considered to be from the same site
    Checked 2026-10-10.

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