Multifactor authentication (MFA) requires users to provide two or more verification factors to gain access to a resource such as applications, online accounts, or VPNs, making it significantly more secure than single-factor authentication methods. Tokens and Pluggable Authentication Modules (PAM) are forms of single-factor authentication methods, whereas System Security Services Daemon (SSSD) is an authentication broker but does not inherently indicate a requirement for multiple forms of identification.