Bitwarden is a popular, open-source password manager that securely stores passwords, passkeys, and sensitive data in an end-to-end encrypted vault, accessible across all devices via apps, browser extensions, and web. It offers free plans for individuals with core features, premium upgrades for advanced security (like YubiKey, attachments, emergency access), family plans, and robust enterprise solutions with features like SSO, self-hosting, and directory sync, all built on strong security principles like zero-knowledge encryption and transparency.