Do we need passport to travel within india ?

If you are a citizen of India, no.

If you are a citizen of another country, yes, you will need it normally for most travel and most hotels,

If you are a citizen of India, no.

If you are a citizen of another country, yes, you will need it normally for most travel and most hotels,

You require a visa if you are not a citizen of India, however, there terms of getting visa is very short, I received mine in 4 days, it was 4 years ago though.