V-models, also called Verification and Validation models, are interactions executed consecutively in a V-shaped. Phases are completed sequentially before next starts.
1. VerificationIt includes static examination technique (audit) that is managed without executing code. Item verification evaluates whether specified needs are met during item development.
2. Validation It includes dynamic examination technique (utilitarian, non-practical) that is managed by executing code. It determines whether the product meets the client's expectations.