How is Kashmir a good example of irredentism?

Irredentism is related to, but distinct from, secession. Irredentism is the process by which a part of an existing state breaks away and merges with another, where as in secession merging does not take place. The importance of irredentism in international relations is based on the intersection between nationalism and the causes of war; because such a movement invariably means taking land from another state, irredentist claims have been known to provoke ethnic conflicts and territorial aggression. The continued discord between countries and states means that the potential for irredentist wars remains serious.