What is BRD? How is it different from SRS?

Business Requirements Document (BRD) describes in detail the business solution for the project as per business/customer/client’s needs and requirements. It includes the purpose of starting the project, what business solution does it provides, the purpose behind doing the project, its features and functionalities,

A software requirements specification (SRS) is a description of a software system to be developed. It is modeled after the business requirements specification (CONOPS). The software requirements specification lays out functional and non-functional requirements, and it may include a set of use cases that describe user interactions that the software must provide to the user for perfect interaction