This article focuses on comprehending the idea of management information systems (MIS), the necessity for MIS, the benefits of MIS in an organization, the MIS model, choices and decision-making systems, and, most importantly, the function of MIS in decision-making. It discusses MIS in detail, including the idea of MIS, the MIS model utilized by companies, how MIS is useful, and why a company needs MIS. The next section provides an overview of choices and the decision-making system, which is required to comprehend the decision-making process. Management information systems (MIS) are a structured, varied, and automated information system that is concerned with the process of collecting, storing, and transmitting important information to support an organization's management activities. Finally, the function of management information systems (MIS) in organizational decision-making is the main emphasis of this article. How MIS is used to make choices in a company, what difficulties the organization faces in this process, and a few suggestions to address these issues. It gives a quick overview of why MIS helps people make better decisions.