The Software Requirements Specification (SRS) is a document that defines the functional and non-functional requirements for a software product. It outlines the scope of the project, general descriptions, specific requirements, analysis models, change management process, and appendices. The SRS should be concise, unambiguous, and easily understood by both technical and non-technical stakeholders. It provides a comprehensive overview of the software product's functionality, user interfaces, hardware interfaces, software interfaces, communications interfaces, functional requirements, use cases, classes/objects, non-functional requirements, design constraints, logical database requirements, and other relevant details.