Gmail
In short: Gmail is Google’s free e-mail service, launched in 2004.
In more detail: It offers a lot of storage, search, a spam filter and is linked to the Google account, calendar and Drive.
In Depth
Special features
Conversation view, labels instead of folders, filters, connection via IMAP and SMTP. Data processing by Google is controversial from a privacy point of view; encryption (TLS) only protects the transport.
Security
Enable two-factor login (MFA) or passkeys, watch out for phishing. See Outlook, spam e-mail.