web.de is a German consumer internet portal and freemail brand operated by 1&1 Mail & Media GmbH, part of United Internet AG. The email product is FreeMail and its paid upgrades: a browser- and app-based mailbox with address book, calendar, and Online-Speicher cloud storage.
It exists as mass-market German mail under the E-Mail made in Germany TLS alliance, not as default end-to-end encrypted privacy mail. FreeMail is financed by advertising under a Consent or Pay model.
The concrete differentiator is that DE-sited mail and cloud at consumer scale, with optional PGP, on the same identity as a large German-language portal.