a detailed description of the design and materials used to make something
the term is used differently in different technical contexts
A specification often refers to a set of documented requirements to be satisfied by a material, design, product, or service
Functional:
having a special activity, purpose, or task.
designed to be practical and useful, rather than attractive
Requirement: In product development and process optimization, a requirement is a singular documented physical or functional need that a particular design, product or process aims to satisfy
Stakeholder: a person with an interest or concern in something (especially a business)
What is a functional specification?
A functional specification is a formal document used to describe a product’s intended capabilities, appearance, and interactions with users in detail for software developers. The functional specification is a kind of guideline and continuing reference point as the developers write the programming code
A functional specification works like a blueprint that helps the development team to understand how an application will function. It describes the user experience step by step.
A functional specification basically tells developers what features they need to build and why. It also helps all the stakeholders involved in the process to work through their often diverging opinions by focusing on a set of goals