Question

explain the process of detecting the president of India

Answer 1

I think you mean 'electing' instead of 'detecting' check your question !!

If electing then here's your answer :

The President of India is indirectly elected by an electoral college consisting of the elected members of both houses of parliament, the elected members of the Legislative assemblies of the 29 states and the elected members of the legislative assemblies of the Union Territories of Delhi and Puducherry.