Private Members' Bills are Public Bills introduced by MPs and Lords who aren't government ministers. As with other Public Bills their purpose is to change the law as it applies to the general population
Public Bill Committees are assigned to consider the committee stage of a bill in the Commons.The committees can take evidence from outside of Parliament. This is intended to give Committee members more information on which to make their decisions.
The procedure for passing the different types of Bills is broadly similar in both Houses. At a very simple level, a Bill must pass through several stages - in both Houses - to become an Act. Find out more about the passage of a bill.