# Audience Segments & Taxonomies
There are two ways to expose the data onboarded via [server-to-server](/guides/server-to-server) within MediaMath Platform:
* **Taxonomies**
  * These can be global, meaning all MediaMath customers will have access to the segments within the taxonomy in MediaMath Platform.
  * These can be permissioned so that only select MediaMath customers have access to the segments within the taxonomy in MediaMath Platform.
* **External Data Segments**
  * These represent a single segment and are always permissioned.
  * These are also referred to as Data Pixels.

It's possible to use both methods to achieve a mix of global and permissioned taxonomies & external data segments to suit your needs and the needs of your customers.
Note: The [S2S data transfer](/guides/server-to-server) is the same for both global and permissioned taxonomies, as well as external data segments.