API means Application Programming Interface.

It describes a set of rules that allows 2 pieces of software to work together.

In b2evolution, there are several types of APIs:

• The External APIs / Web Services that allows external and/or remote applications to query or even post to b2evolution over the web.
• The Skin API that allows to develop Skins that work in b2evolution
• The Plugin API that allows to develop Plugins that work in b2evolution