Explain How SD and MM are connected in SAP?

The goods/services from a plant can be sold by one or more sales organizations. It is also possible that single sales organizations sells goods/services for several plants. When the sales organizations sells for more than one plant belonging to one or more Company Codes, then this is called inter-company sales, and will require you to make some special configurations in the system. A sales organization, attached to a Company Code, is further divided into distribution channels and divisions in SD. A division typically represents a product line, and is assigned to a material in the material master.