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Read this before relying on anything on this tech site.

A few things to keep in mind while reading.

General information only

These explainers describe how common technology works in broad terms. Specific products, settings and security details change over time, so always check a service's current guidance for exact steps.

Security is your responsibility

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Corrections

Errors are fixed when pages are revised; each page shows the date it was last checked.

Last checked 2026-11-10