What is definition of software specification, software development, software validation, software evolution?

Answer is Pointe form

>> software specification
A document that describes what the software will do (e.g., how it works, what the screens look like, what happens when a button is clicked, etc.) Generally this is the first step of software programming.

>> software development
Actually coding what is described in the specification. This is the second step in programming.

>> software validation
Testing the developed software to make sure it matches what the specification states. The third step in programming.

>> software evolution
Changes made to software over time, after it is deployed, so that it more closely meets the expectations and needs of end users.

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