The purpose of this article is to elucidate the evolution of Wittgenstein’s philosophy. After having considered in the Tractatus, natural language as suffering from many deficiencies and does not respond to his aspirations which are the establishment of a logically perfect language by the precision and adjusting so that each object should correspond only one word, this position has evolved in Investigations for a reconsideration of natural language as having a particular importance for its infinite uses, that take the form of a "language- game" using specific rules. This new dynamic analysis of language, as opposed to the static analysis of the Tractatus, permitted natural discourse to regain its semantic dimension to remain creative and ingenious. What distinguishes the two theories? And what are the resulting philosophical consequences? This is what we will try to clarify.