Let me move this to the Account, Payment, & Plan forum for you, which is the appropriate forum for your question.
An individual plan is tied to one email/Adobe ID. The product can be installed and activated on TWO machines, but you can only use it on ONE machine at a time.
You cannot share an individual plan. If the person it was purchased for leaves, they take the license with them, but whoever bought it will have to remember to cancel it before renewal or they'll be charged again.
Business plans, I think, let you purchase multiple licenses that can be assigned as needed to users. They still need an Adobe ID to log in with, but the plan administrator assigns the licenses to an Adobe ID and manages which programs that ID can use. When someone leaves who was assigned a license, the employer keeps the license and can reassign it to someone else.
The Using the Community forum is for help in using the Adobe Support Community forums, not for help with specific programs, installation issues, or account issues such as subscription questions or billing problems, or generalized questions about Creative Cloud services.
* Product questions should be posted in the associated product community.
* Installation questions should be posted in the Download & Install community.
* Account issues, including subscription questions or billing problems, should be posted in the Account, Payment, & Plan community.
* Questions about the Creative Cloud desktop app or general questions about apps in the Creative Cloud should be posted to the Creative Cloud Services community.