Mandatory Requirement means a condition set out in the specifications / statement of work that must be met without exception.

When an action or requirement is deemed mandatory, it implies that it must be done or adhered to without exception or choice. In essence, it is a non-negotiable obligation imposed by an authority or governing body. Mandatory requirements are typically established to ensure compliance, maintain standards, or promote safety and security.

When talking about laws and rules, "mandatory" is often used to indicate a non-negotiable requirement backed by law. "Required," while still important, might not have the same level of legal weight and could imply an obligation more open to interpretation or flexibility.