This is a formal document used to describe in detail for software developers a product's intended capabilities, appearance, and interactions with users.

Functional specification

Explanation:

Functional specification is a formal statement, more like a contract between a software developer and an employer on what he (the developer) should do. the document is use to describe in detail for the developers what a product is suppose to do, how the user interface of the product should look like, how it should interact with users and much more.

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