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Software verification ensures that "you built it right" and confirms that the product, as provided, fulfills the plans of the developers.
Software validation ensures that "you built the right thing" and confirms that the product, as provided, fulfills the intended use and goals of the stakeholders.
If such artifact is incomplete or wrong, the developers will not be able to build the product the stakeholders want.
This is a form of "artifact or specification validation".
This kind of verification is called "artifact or specification verification".
From a testing perspective: Both verification and validation are related to the concepts of quality and of software quality assurance.There are two ways to perform software validation: internal and external.During internal software validation, it is assumed that the goals of the stakeholders were correctly understood and that they were expressed in the requirement artifacts precisely and comprehensively.By themselves, verification and validation do not guarantee software quality; planning, traceability, configuration management and other aspects of software engineering are required.Within the modeling and simulation (M&S) community, the definitions of verification, validation and accreditation are similar: The definition of M&S validation focuses on the accuracy with which the M&S represents the real-world intended use(s).
Building the product right implies the use of the Requirements Specification as input for the next phase of the development process, the design process, the output of which is the Design Specification.