Search groups are just like regular groups except people are included based on easily selected criteria. Use them to create any report you need and to ensure people don't slip through the cracks.
Search is added next to the name of search groups. Also note that there is no Remove selected members option on the action menu and no Add people button. This is because the group members update dynamically based on the search criteria, otherwise search groups are just like any other group.
Learn how to create "search groups", these groups find group members based on filters that you specify. The list of group members will always be up to date to help you find all the people that match the filter.
Here is an example search group that is looking for mothers that attend church regularly and who have children that attend regularly.