What happens when I delete an App ID in my developer account?

I clicked the delete button to an App ID in my developer account and I got a message saying "All certificates associated with the App ID will be deleted and any provisioning profiles associated with this App ID will be invalidated." Why would the entire provisioning profile be invalidated? What about the other App IDs in that provisioning profile? Does that mean I wouldn't be able to use the provisioning profile for those other App IDs at all?