1.Political science is a branch of social science, which deals with system of government, political activity and behavior.
2. it deals with theory and practice of politics.
3. political scientists try to reveal relations underlying political events and conditions. thus they try to find out the way in which world politics work.
4. political science draw its back ground from economics,law,history and sociology.
5. it is as old as the human race, with the great political scientist as Kautilya[also named as Chanakya]. but it is officially codified only in 19th century.