There´s much confusion about those two words. Often, they are used interchangeably, but they are not the same.

A good review of those differences are showed in 

This articles carries a simple yet clarifying model that relates data, information and knowledge. Information is a instance of data, captured in a specific moment (like a photo). Knowledge is the result of information processing, usualy through some model or previous experience. As a result, the same information can generate two differents conclusions ("knowledge") in two different persons, as those two individuals have different mappings or models used to process the same information (see how people react to a referee decision on any sport).

Google should rename it´s "Google Knowledge Graph API" to "Information Graph API"? 


 What you think?