This article summarizes the default rules for the creation of teams.  If however, you wish to disable the default team rules, and instead require (or not require) certain fields, this can be done by request.  See this article for more information.

By default, when creating a team, you are not required to name an associated organization.  Even when someone fills in an organization name, it is just a text reference to the organization, and not automatically associated with a corresponding organization in your data.  With this option enabled - you can require a search of your existing organization database, and have team captains make that association if it exists.  See this Chapter for information on how this option works, and how to administratively update your data to determine which organizations become searchable.

A team is always made up of named team members who can then be signed up for a volunteer opportunity by the team captain.  With this feature enabled, a team captain, during opportunity sign-up, can sign up existing team members AND reserve spaces for unnamed volunteers (guests / anonymous slots).  See this article for a description of how this option works, and how to administratively enable it. (Note: This feature can be enabled by your system administrator and requires no request to the support team in order to use).