It usually consumes and publishes API's to facilitate the "ESB" function (which is incredibly vague, but pretty much acts as the "glue" to do all-the-things).

It usually consumes and publishes API's to facilitate the "ESB" function (which is incredibly vague, but pretty much acts as the "glue" to do all-the-things). The ESB term is so overused, and products like the one you linked have so much functionality baked into them, they can act as pretty much any business or system function in an organisation. And they do.