Whereas Artificial Intelligence as we know it can only do one or a few things with any competency, Artificial General Intelligence essentially encapsulates most, if not everything a human can do and more, and with greater ability than the average human. This point at which AI can surpass humans by virtually every human metric is what many refer to as the Singularity, which is predicted to happen between 10 and 15 years from now (other estimates vary). It's called the Singularity because it is seen by many as the single most important event in human history, in which we create a being far superior to us, essentially rendering us as the new Chimpanzees in the wake of this new super intelligence. There's a lot more to this, but that's the basic gist of what you need to know. It's a highly interesting topic, and I highly recommend researching it further.