The Business Requirement Specification is known as “BRS” and Functional Requirement Specification is known as “FRS”. In general, the use of these documents is determined by the type of organization & firm, as well as their standards & how they follow processes.
BRS vs FRS
The main difference between BRS and FRS is that a BRS document is written at the start of a project to show the strategy to meet the client’s needs on a more basic level. And FRS is the most comprehensive document created by developers and testers, including all software components and expected interactions, as well as business, compliance, and security requirements.