What are the different types of SAP modules? How do they work?

Let me explain in very simple way.

An icecream has many flavours , is it. Even though each flavour has its own taste and price, they all fall under the category called "Ice cream" and they are grouped together and placed together in the market / online stores . 

Similarly, SAP have many modules like FICO, BI,BQ,ABAP, CO, MM, etc.. and each module has its own uses and all are used for business activities.

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SAP modules are categorized into Functional and Technical modules. 1. Functional Modules (Manage business processes) SAP FI (Financial Accounting): Manages financial transactions, balance sheets, and tax calculations. SAP CO (Controlling): Handles cost management and internal reporting. SAP SD (Sales & Distribution): Manages sales orders, pricing, shipping, and billing. SAP MM (Materials Management): Oversees procurement, inventory, and vendor management. SAP PP (Production Planning): Controls manufacturing and production processes. SAP QM (Quality Management): Ensures product quality through inspections and audits. SAP PM (Plant Maintenance): Maintains equipment, repairs, and preventive maintenance. SAP HCM (Human Capital Management): Manages payroll, recruitment, and employee data. SAP SCM (Supply Chain Management): Coordinates logistics, warehousing, and demand planning. SAP CRM (Customer Relationship Management): Handles customer interactions and service management. 2. Technical Modules (Support system operations & customization) SAP ABAP (Advanced Business Application Programming): Used for custom development. SAP Basis: Manages system administration, performance, and security. SAP BW/BI (Business Warehouse/Business Intelligence): Data reporting and analytics. SAP HANA: High-performance database for real-time processing. SAP Fiori: Enhances user experience with modern UI applications. SAP PI/PO (Process Integration/Orchestration): Integrates SAP with other systems. How They Work SAP modules interact with each other in real time. For example: A Sales Order (SAP SD) triggers Material Procurement (SAP MM) and Production (SAP PP). The system updates Inventory (SAP MM) and **Financial Accounts (SAP read less