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Explore Proton Mail ↗Proton Mail
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EDITORIAL LIBRARY
Privacy glossary
Look up privacy and security terms you’ll see in our guides.
Tracking cookie
A browser-stored identifier that can help sites remember or recognize activity.
Read more →End-to-end encryption
Encryption designed so only the communicating endpoints can read message contents.
Read more →Email alias
An alternate email address that delivers messages to another inbox or is managed by an alias service.
Read more →Two-factor authentication
An account protection method that requires an additional proof beyond a password.
Read more →Data broker
A business that collects, aggregates or sells information about people, sometimes including public-record or commercial data.
Read more →VPN
A virtual private network routes your internet traffic through a provider-controlled connection, changing what certain parties can see.
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