ERP system is a set of modules (or even separate applications), each of which manages a certain process: procurement, sales, production, accounting and tax accounting, HR processes, customer support, CRM, warehouse logistics, etc. The system covers the basic processes of all areas of the enterprise.
ERP system is a comprehensive system for managing information within the organization that solves the whole complex of tasks of managerial, regulated and other types of accounting, in contrast to specialized software designed to automate a specific business process or activity.