Functional requirements describe the characteristics of the final deliverable in ordinary non-technical language. They should be understandable to the customers, and the customers should play a direct role in their development. Functional requirements are what you want the deliverable to do.
Vehicle Example
If you were buying vehicles for a business, your functional requirement might be: “The vehicles should be able to take up to a one ton load from a warehouse to a shop.”
Computer System Example
For a computer system you may define what the system is to do: “The system should store all details of a customer’s order.”
The important point to note is that what is wanted is specified and not how it will be delivered.
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