When you publish your data, GeoServer exposes it through standard services, that is, WMS for maps, WFS for features, WCS for coverages, and WMTS for map tiles. Each one of them can be configured from this section, changing the default settings. You can also selectively disable them. This may be useful to increase the GeoServer performance on small servers. By default, all services are enabled:
Web Map Tile Service (WMTS) is an OGC standard protocol to serve pre-rendered georeferenced map tiles over the internet. On the administration interface, you can change the service metadata, or enable and disable the service. Please note that WMTS is delivered from the integrated GeoWebCache so if GWC is disabled then WMTS would not be available.