> For the complete documentation index, see [llms.txt](https://docs.goodfit.io/goodfit-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.goodfit.io/goodfit-docs/product/segments/dynamic-segments.md).
# Dynamic Segments
There are two types of segments you can set up in GoodFit: **static** and **dynamic**.
### Static Segments
When a segment is static, it means that the membership of companies and contacts within the segment doesn’t change over time unless the segment criteria is manually changed or the segment is manually refreshed.
Any companies and contacts remains part of the segment even if their data has since changed and they no longer meet the criteria.
It is important to note that the data on the companies/contacts are still refreshed, it is just the membership that doesn’t change (e.g., if the contact leaves a company, “Is Former Employee?” will be updated to true).
The main use case for static segments is situations where you don’t want companies or contacts to be either added or removed from the segment unless you manually trigger the refresh. For example, if you run your book building exercise once a quarter you want to keep the segment you’re using for list building static, so your sales team has a consistent list of companies to work on throughout the quarter.
If you are running a one-off campaign (e.g., targeting some companies with a product launch), there’s no need to have the segment updated either.
### Dynamic Segments
Dynamic segments, on the other hand, are automatically refreshed every day. With each refresh, the system checks for two things:
* Are there any companies that had any changes in their data and now match the segment's criteria? If so, and the company wasn’t previously in the segment, it is automatically added.
* Are there any companies that are part of the segment that no longer match its criteria; those are removed from the segment.
You can mark any segment you created as dynamic in the “Edit Segment” screen.
You can identify dynamic segments by a “Dynamic” label next to their name.
Note: When a new company is added to the segment, the contact search for each persona is run automatically — and the company automatically gets enriched with the matching contacts.
{% hint style="info" %}
**Reasons for Removal**
For companies, there’s only one reason why a company is removed from a segment - if it no longer matches segment criteria.
For contacts, there’s additional reasons:
* If the related company is removed from a segment.
* If the contact changes their title and no longer matches persona criteria.
* If there’s a better contact available at the company (with a higher persona rank).
* If the contact no longer works at the company.
{% endhint %}
### Refreshes
Dynamic segments are refreshed daily. If you make any changes to the calculated data points (such as score, tags, or other segments) and the segment you’d like to see refreshed relies on them, you need to refresh it manually if you want the changes to take effect immediately.
Note that you can refresh a static segment manually by clicking the “Refresh segment” option. It will have the same effect as if the segment were dynamic.
### Removed Segment Companies and Contacts
You can review which contacts and/or companies have been removed from a segment using the filters under "View".
For each company and contact, you can also see the date it was added / removed from the segment, as well as the reason why it was removed.
