Suppose I have a compressed file and it is not possible to compress it more without loss of information. We say that this file is random or pseudorandom.So, if the randomness means not comprehensible and not compressible, I don't understand why ths file is, at the same time, information that my computer and I can understand.This file could be a book that my computer can show to me and read, and I can read and sum it ...so, it is really randomness?Note: I understand that if I can make a summary of a text or define it with less words, that not means that it could be possible to get all the information of this book again, of course but this book is not random for me.Note II: I undesrtand ramdoness as something that is not possible to reproduce with an smaller algorithm. I mean a string is random when I can't find an other smaller string that is an algorithm that can reproduce the first one.    Note III: I want to thank you all for your help. 
compressed information = randomness?
information theory;data compression