Hello Philipp,
The plugin has a modular architecture: it connects to coin adapters and app extensions.
You can connect to a full node if you wish, and that allows use of some of the lesser-known coins with apps such as the WooCommerce payment gateway. You can also install a cloud wallet adapter if you do not wish to install a full node.
All of this is explained in the readme and documentation. Choosing between a full node or a cloud wallet adapter has its tradeoffs. You can have a look if you like.
kind regards
Alex