fact that universal lossless compressor is just not possible we looked at some intuition as they're being redundancy in most of the data that we encounter in the real world and because there is redundancy I'm totally speaking there should be a way to exploit that because it's only the did that really occurs in the real world that you need to have a good compression for and the data that doesn't really occur in the real world even though they are also can be represented in principle bit strings you might not care much