The need for the importance of effective management of the enterprise's business processes raises urgent problems of its automation with the help of the introduction of modern corporate information systems. ERP systems include the systems that cover the most important business processes of the enterprise and ensure their integration, optimization, as well as balanced management of the resources involved. The essence, architecture and general characteristics of ERP systems, their functionality and implementation at enterprises are considered. An analysis of literary sources was carried out on the study by many scientists of the essence of the concept of ERP systems, their historical development, concept, as well as advantages and disadvantages and economic efficiency. It was determined that ERP systems allow the most effective planning of all commercial activities of a modern enterprise, including financial costs for equipment restoration projects and investments in the production of new products. The relevance of the research, which is determined by the modern needs of managing business processes of an enterprise or company based on ERP systems, is considered. The expediency of using systems of this class is caused by the need to manage business processes in conditions of inflation and severe tax pressure. The purpose of this work is to study the concept of ERP and the functional capabilities of ERP systems for small and medium-sized enterprises. Various interpretations of the essence of the ERP system, the modern market and examples of existing ERP systems of Ukrainian software manufacturers are presented. To understand the functioning of the ERP system, its structure was considered: blocks (platform and modules); three-level client-server architecture (database, application server, user interface); core modules (production management, supply management, financial management, resource management, customer relationship management, project management). It was determined that the architecture of the software product plays a very important role when selecting a system for business optimization; modules of the ERP system allow you to optimize various aspects of the company's work. The peculiarities of the architecture of the IT-Enterprise ERP system and the functionality of the Perfectum CRM+ERP system for automating business processes of the enterprise are considered. The general characteristics of the systems for the execution of business processes of the enterprise are presented and the most common approach to the classification of ERP systems for the automation of the enterprise's business is determined. The functionality of the Perfectum CRM+ERP system for small and medium-sized businesses is considered. The author proposed the use of such systems for small and medium-sized businesses.