The term 'API economy' is being used more and more these days. The phrase is a combination of an IT term and a business term; it refers to a trend that is quickly changing our method of doing business. For example, APIs have already become an established fact in the retail sector and the travel sector. What exactly are APIs? Why are they suddenly popping up everywhere? Why shouldn't we fear them? And if we want to use them, how do we take the first steps?