What are Company Apps?
A Company App is an Application that is typically used by all people in the company and there is available to everyone in the company – an example of a Company App is an employee self service application that any employee can use to maintain their personal information such as address, telephone number, email etc.

What are Team Apps?
 A Team App is an Application that is typically used by people working in teams and may not be available to everyone in the company – an example of a Team App is an Opportunity Management application that only Sales personnel can use to maintain information such as Customer Name, size of a deal, probability of close, next steps to close the deal etc..

What is a Space?
 A Space is a grouping of users who typically work together to accomplish a task. Examples of spaces are Sales and Finance.
The Sales Space may contain users who are typically focused on selling to and supporting customers.
The Finance space may typically contain users who are  focused on ensuring that sales to customers meet minimum margin requirements for profitability and maximum discounts applicable to product line items etc.