Initially, it is significant to note that the human race is not even on this scale yet. Since we still sustain our energy requirements from dead plants and animals, here on Earth, we are a poor Type 0 civilization (and we have a LONG way to go before being promoted to a type I civilization). Kaku inclines to believe that, all things taken into concern, we will reach Type I in 100 – 200 years time. But what does each of these classes really stand for in literal terms?
At this stage, we would have developed colonies of robots that are proficient of ‘self replication’; their population may upsurge into the millions as they spread out across the galaxy, inhabiting star after star. And these being might build Dyson Spheres to encapsulate each one, making a huge network that would carry energy back to the home planet. But extending over the galaxy in such a manner would face numerous difficulties; namely, the species would be constrained by the laws of physics. Chiefly, light-speed travel. That is, except they develop a working warp drive, or use that spotless energy cache to master wormhole teleportation (two things that remain theoretical for the time being), they can only get so far.
Kardashev believed a Type IV civilization was ‘too’ advanced and did not go beyond Type III on his scale. He thought that, confidently, this would be the extent of any species’ capability. Many think so, but a few believe there is a further level that could be achieved. (I mean, surely there is a limit?) Type IV civilizations would almost be capable of harnessing the energy content of the whole universe and with that, they could traverse the accelerating expansion of space (additionally, advance races of these species may live inside supermassive black holes). To previous methods of producing energy, these kinds of feats are considered impossible. A Type IV civilization would require to tap into energy sources unknown to us using strange, or currently unknown, laws of physics.
Type V. Yes, Type V might just be the next possible advancement to such a civilization. Here beings would be like gods, having the knowledge to manipulate the universe as they please. Now, as I said, humans are a very, very long way from ever reaching anything like this. But it’s not to say that it cannot be achieved as long as we take care of Earth and each other. To do so, the first step is to preserve our tiny home, extinguish war, and continue to support scientific advances and discoveries.