Summary:

• **What is Multi-Tenancy?** Multi-tenancy is a way to run multiple separate businesses or groups using the same software application, kind of like how one apartment building can have many different families living in it. Each group has their own private space and data, even though they're all using the same building (or in this case, the same software).

• **Why Do Companies Use It?** Companies use multi-tenancy because it saves money and makes things easier to manage—instead of building separate software for each customer, they can use one software that keeps everyone's information separate and secure. It's like having one teacher manage multiple classrooms instead of hiring a different teacher for each room.