Few decades onwards decision-making systems have underwent many changes with the new technologies of Data warehouse/Data Mining. The tendency in OLAP data plays an important role on Business Intelligence over OLTP data, i.e., day to day data. Business Intelligence is not just for big organizations, but it is a simple technology that can be used by small and medium enterprises (SMEs) too for better results in their businesses. The main intention of this paper is to describe the usage of BI and how it is useful to the organizations in decision making. BUSINESS INTELLIGENCE (Bl) is one of the simplest technology to understand. However, getting it into the right direction is the most difficult tasks for both small and large companies. In simple terms, Bl is all about taking the volume of data that every company collects on daily basis and present it in a form that can be understood by the decision makers. The ability to use historical information to make business decisions are the fundamental basis of a business. Transforming data into information and bringing together disparate sources of valuable information to analyse BI can enable SMEs to gain timely access to high quality, reliable business data and metrics. That enables them to make better-informed decisions while dealing with customers, suppliers or internal processes. Fundamentally, BI enables companies to more easily identify and reduce the cost and also to take guesswork out of decisions that help drive top-line revenue growth.