What’s Specification and Requirement mean?

So many times we read, hear that requirement should be clear, understandable but what exactly requirement is it? Does requirement and specification are equivalent?

Requirements are what program and system should do, Specifications are how you are going to do it.

Requirement represents the application from the perspective of the user or business. Specification represents the application from the perspective of technical team.

Specifications are outcome of the conversations, discussion of group of people on the requirements.

Tester need to be work on the specification because it specific ,It’s help you out to do testing activity because requirements might be unclear ,messy sometimes. And “Yes” Requirements and Specifications are not equivalent.