What is secularism?

A secular state is one in which the state does not officialy promote one religion as the state religion

Secularism refers to the separation of a state with its religion
 

Secularism means the non-interference of the state and the religion in the affairs of each other. In the Indian context, it refers to the freedom of an individual to practice the religion of her/his choice. India is a secular state as the state has no religion of its own. The Constitution of India guarantees equality of all religions and prohibits discrimination against any individual on grounds of religion.

Secularism is the principle of the separation of government institutions and persons mandated to represent the state from religious institutions and religious dignitaries.