Miguel D’Addario 
Theory and Practice of Communication [EPUB ebook] 

The theory of information emerged at the end of World War II in the 1940s. It was initiated by Claude E. Shannon through an article published in the Bell System Technical Journal in 1948, entitled A Mathematical Theory of Communication. At that time, the aim was to use communication channels more efficiently, sending a quantity of information through a given channel and measuring its capacity; the optimal transmission of messages was sought.