Abstract
Innovation is a concept widely studied in scientific literature. However, it seems that a lot of work can still be doing about it. This is not a new concept, but it is still very difficult to define, because all the studies have different opinion on this subject. Innovation is a very simple word, but a very complex concept, it refers to many interrogations difficult to answer such as: What is innovation? Is it a process or an event? Who are the innovators ? What's the use of innovation ? and Innovation, what for ? Scientific literature widely speaks about all that questions, but many studies disagree on most of them, that is why it is not easy to answer those questions. However, answering those questions is necessary if someone wants to study this concept. That is why in this paper we will try to give a clear answer to all that questions. However, all the answer here must be considered by the reader as opinion and not as true, indeed as we already says, this concept has not a unique definition. The reader, if unsatisfied by the definition given here can report itself to the bibliography and try to find a definition that suit more to him.
