Hindusim is divided into two main streams :

(i)  Vaishnavism
(ii) Shaivism

Vaishnavism

Vaishnavism is the stream of Hinduism whose followers are called Vaishnavas/Vaishnavites. They are the followers of Vishnu-Narayana who is the preserver of the Universe. Vaishnavas believe that Vishnu is the supreme God ("Parambrahman") and all other living entities are subservient to Him. Vishnu is worshipped in human forms. Vaishnavism is very common in the eastern, western and northern parts of India.

Shaivism

Shaivism is the stream of Hinduism whose followers are called Shaivas/Shaivites/Saivites. They are the followers of Shiva. Shaivites believe that Shiva is simultaneously the destroyer and the creator of Universe. Shiva is worshipped as a "lingam" that represents the entire universe and also in the human forms. Shaivism is more common in South India and in Kashmir.