A BRD (business requirements document) explains why a project exists and what the business needs from it. A PRD (product requirements document) describes what the product does for its users. An SRS (software requirements specification) states, precisely enough to build and test against, how the...

Source: [Dev.to](https://dev.to/oleksandr_tytarenko/prd-vs-brd-vs-srs-which-requirements-document-do-you-need-4opm)

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