Short version: Personal Accounts and Organizations have different administrative controls. You must provide a valid email address, and you may not have more than one  Account. You alone are responsible for your Account and anything that happens while you are signed in to or using your Account. You are responsible for keeping your Account secure.

1. Account Controls
Users. Subject to these Terms, you retain ultimate administrative control over your Personal Account and the Content within it.

Organizations. The "owner" of an Organization that was created under these Terms has ultimate administrative control over that Organization and the Content within it. Within the Service, an owner can manage User access to the Organization’s data and projects. An Organization may have multiple owners, but there must be at least one Personal Account designated as an owner of an Organization. If you are the owner of an Organization under these Terms, we consider you responsible for the actions that are performed on or through that Organization.

2. Required Information
You must provide a valid email address in order to complete the signup process. Any other information requested, such as your real name, unless you are accepting these terms on behalf of a legal entity (in which case we need more information about the legal entity), in which case additional information will be necessary for payment and billing purposes.