A System Requirements Specification (abbreviated SyRS when need to be distinct from a Software Requirements Specification SRS) is a structured collection of information that embodies the requirements of a system.
A business analyst, sometimes titled system analyst, is responsible for analyzing the business needs of their clients and stakeholders to help identify business problems and propose solutions. Within the systems development life cycle domain, the BA typically performs a liaison function between the business side of an enterprise and the information technology department or external service providers.
References
System requirements specification Wikipedia(Text) CC BY-SA