Hola Lunacinti, Gracias por visitar las Comunidades de soporte de Apple en español. Encontré este artículo que podría serte útil te adjunto el enlace
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First-Party cookies
You can see the Block All Cookies setting in the Privacy & Security section - when this slider is slid to the right (and turned green), then all Cookies will be blocked. Be careful; blocking all cookies may actually prevent you from using a lot of websites normally! First-Party Cookies are usually used when you log in to websites; and you may find you can't use a lot of websites without Cookies enabled.
Third-Party cookies
However, the other setting you want to pay attention to is the one above it: Prevent Cross-Site Tracking. This setting also controls Third-Party Cookies. These are cookies set by sites other than the one you are visiting, and it's one of the major ways that companies track your activity online.
It's very common to disable Block All Cookies (so that cookies are allowed), but to also enable Prevent Cross-Site Tracking (so that third-party cookies are blocked) - as shown in the screenshot.
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Gracias por visitar las Comunidades de soporte de Apple en español. Te invito a que compartas tus resultados con nosotros, al igual de cualquier otra duda que tengas.
Un saludo cordial.