"End-to-end encryption means that the information is scrambled in transit and only the sender and recipient can access it. Regular text messages (SMS messages) and voice calls are usually not encrypted, and can be intercepted in transit or stored on a carrier’s server for extended periods of time.
Email services such as Gmail and Outlook generally offer encryption in transit, which means they can be read on the companies’ servers and by the end users. Messages that are encrypted in transit can’t be nabbed from a telecom network in an accessible format, but they could be accessed through an email service provider or a law enforcement request to that company.
End-to-end encryption—the kind offered by services like WhatsApp and Signal—is considered the best bet for privacy, particularly when paired with the option to auto-delete messages after a set period of time, says Mullin."
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