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Functional requirements.

also: functional requirement

What the system does: the features users and admins rely on, such as uploading a photo or sending a message.

the two-minute refresher

Functional = what the system DOES (create account, upload, search, send).
They shape the feature set, the user interface and the business logic.
Clarify them in the first minutes of an interview, before drawing anything.
Pair every list of features with its non-functional targets: they decide how to build it.

Where the course teaches it

W00 · Part 1System Design Fundamentalslearn it →

Related concepts

Non-functional requirements
High-level design