Hello Udaya,
SAP ERP is a software product that helps you to manage all the resources of an organization.
SAP ERP consists of several modules, including utilities for marketing and sales, field service, product design and development, production and inventory control, human resources, finance and accounting. SAP ERP collects and combines data from the separate modules to provide the company or organization with enterprise resource planning.
It has modules. A client who wants to implement SAP in their company will select the modules required for their business.
Solutions provided are:
Financials
Human Resources
Customer Relationship Management
Supplier Relationship Management
Product Lifecycle Management
Supply Chain Management
Business Intelligence
Major module usually implemented are:
1. FICO - Finance and Control
2. MM - Materials Management
3. SD - Sales and Distribution
4. QM - Quality Management
5. HCM - Human Capital Management
6. PP - Production Planning
7. WM - Warehouse Mangement
There are also industry specific modules like
IS - Mill - (industry solution for mills)
IS - Oil - (industry solution for petroleum related companies)
IS - Auto - (industry solution for Automobile Industries)
IS - Retail - (industry solution for retail organization)
See information about different solutions Overview | ERP Software | Business Process | Solutions | SAP
So basically customers/clients may install one or more ERP systems depending upon the need for their business.
Many big customers who has complex environment and many users install ERP systems for different solutions.
Hope you got an idea on this.
Regards,
Archana