Create a Segment
While contact lists are created by manually adding contacts to a static list, segments are dynamic lists of contacts created by defining contact criteria and selecting filters.
When you create a segment, you can filter using any field in the Contacts (contacts) table, including custom fields, and by joining the Contacts table to other tables. For example, some segments might include all contacts who live in Montana, all contacts between the ages of 18 and 24, or all contacts who live in Montana and are between the ages of 18 and 24. You can also filter contacts by whether they have submitted an incident related to a certain product.
After you create a segment, it can be used in mailings and surveys and the group of contacts is constantly adjusted and updated as contact data meets or falls outside of the segment requirements. For example, a segment that selects customers based on their age produces a different result every time it is used for a mailing, assuming that customer contact data changes.