Legislative proposals are brought before either house of the Parliament of India in the form of a bill. A bill is the draft of a legislative proposal. The bill when passed by both houses of Parliament and assented to by the President, it becomes an Act of Parliament.
As soon as the bill has been framed, it has to be published in the news papers and the general public is asked to comment in a democratic manner. The bill may then be amended to incorporate the public opinion in a constructive manner and then may be introduced in the Parliament by ministers or private members. The former are called government bills and the latter, private members' bills. Bills may also be classified as public bills and private bills.
A public bill is one referring to a matter applying to the public in general, whereas a private bill relates to a particular person or corporation or institution. The Orphanages and Charitable Homes Bill or the Muslim Waqfs Bills are examples of private bills.
( Please refer the previous question 'How does a bill become law in India?' to have abetter understanding.)