First of all - you should always put a proper Thread heading relevant to your query while creating a new thread. Just a 'Hi' does not make any sense here.
For the answer to your question-
Validation Testing is the process of applying specialized test cases and evaluation procedures needed to establish acceptance for the usage ofa tool an organisation. or in simple words -"a process to identify whether all software requirements have been implemented correctly and completely and are traceable to system requirements". learn more on Basic Testing Concepts which will give you a better idea.
For the answer to your question-
Validation Testing is the process of applying specialized test cases and evaluation procedures needed to establish acceptance for the usage ofa tool an organisation. or in simple words -"a process to identify whether all software requirements have been implemented correctly and completely and are traceable to system requirements". learn more on Basic Testing Concepts which will give you a better idea.