Liberal are people who support change in the society, they oppose any kind of resistance to change either by religion,culture or other traditions. They are often in favor of reforms introduced by govt. or any other political factor. Liberal are opposite of conservatives.Both liberals and conservatives can be libertarian supporting liberty as a liberal or as a conservative.A person who is conservative or liberal and also want to force his/her ideology or believes on others is a fanatic. Libertarian believes in freedom of people and promotes the idea that people should be free to live their lives free from almost all kinds of restrictions either by the State or the society. On the contrary the liberals may believes in States regulation for welfare of the people. The libertarian believes that welfare of the people can only be achieved when people are free to live and develop individual responsibilitly and when every person tries to achieve what is good for him or her directly or indirectly.

The definition of both according to dictionary are;

Liberal

http://dictionary.reference.com/browse/liberal

Libertarian

http://dictionary.reference.com/browse/libertarian

http://politics-mohsin.blogspot.com/2011/12/difference-between-liberal-and.html