Secularism is the condition for harmoniously living together, respecting each and everyone's ideas and is the means of emancipation for all. It is the product of history and of political philosophy which generated a legal framework. This history, this philosophy and this legal framework must be better known to allow both individually and socially appropriate answers to the questions which are encountered. The contribution aims at giving these elements of knowledge while insisting on the necessity for secularism to be practiced as well as taught from a historical approach and from the current state of the role and action of the educational movements and of the secular organizations in complementarity with National Education.