In the fast-changing world, it has become difficult to catch up with all the new concepts and technologies. It is even more complicated to distinguish which of them are really useful and which ones is just hype. In the field of data analytics, it was big data that started this era of doubt. Now, when this concept is clearer, a new wave is coming: Big data for IoT. Despite all the hype around IoT, it is just one of multiple big data sources. But how exactly IoT is connected to big data?