The set of tasks and techniques that are used to perform business analysis are defined in A Guide to the Business Analysis Body of Knowledge.
A business analyst is someone who analyzes an organization or business domain (real or hypothetical) and documents its business or processes or systems, assessing the business model or its integration with technology. The role of a systems analyst can also be defined as a bridge between the business problems and the technology solutions. Here business problems can be anything about business systems, for example the model, process, or method. The technology solutions can be the use of technology architecture, tools, or software application. So System Analysts are required to analyze, transform and ultimately resolve the business problems with the help of technology.
There are at least four types of business analysis:
The Business Analyst, sometimes is someone who is a part of the business operation and works with Information Technology to improve the quality of the services being delivered, sometimes assisting in Integration and Testing of new solutions.
The Business Analyst support the development of training material, participates in the implementation, and provides post-implementation support. This may involve the development of project plans and often requires project management skills.
The BA records requirements in some form of requirements management tool, whether a simple spreadsheet or a complex application. Within the systems development life cycle, the business analyst typically performs a liaison function between the business side of an enterprise and the providers of IT services.