Strong authentication is the foundation of modern cybersecurity. This guide explores the top authentication methods every business should implement in 2026, from passkeys and passwordless authentication to multi-factor authentication (MFA), biometrics, and single sign-on (SSO). Learn how these methods improve security, reduce the risk of credential-based attacks, and deliver seamless user experiences. Whether you're securing customer identities or workforce access, discover the authentication strategies that help protect your business while meeting today's evolving security and compliance requirements.