As a customer to implement C4C, they would approach the SAP for licenses and user credentials. For this the SAP would grant them space in their central sever and that Space is referred to as TENANT. So the organization would place a Subscription for that particular SPACE in the server of SAP. So this particular process of requesting space is called SUBSCRIPTION. When an org approaches SAP for a production tenant SAP would give a test tenant by a free of cost. If you need additional test tenant, you need to purchase additionally.
Public tenant: If you take a space allocation from SAP, that space would be big enough to getter the need of other organizations also, i.e., the same tenant is given to you is given to other organizations also but enough measures to take of the data security.Data would not be misplaced between the organizations but the tenants would be shared. But In this case the development you want to do minimized because the control will be lies with SAP.
Private tenant: the tenant the you have placed subscription for would be completely used for your organization and that space would not be given to any other organization that is called Private tenant. In which case you have more flexibility to customize and develop enhancements on C4C Tenant.
On the left hand side we will have the header data. On the top we have few tabs like overview, feed, recent orders, chats, activities, account team, sales territories. Each Tab provides a different information related to one area under the custom master data.