a) A nation is such type of community which can be very easily described but there has not been any appropriate definition for it. There is no such defining feature for any nation.

b) We can describe nation as a community of communities.

c) Max Weber has defined the state as a body that successfully claims a monopoly of legitimate force in a particular territory.

d) If we describe the relationship between nation and state, we can say that nations are community of communities that have a state of their own. So, we denote it by the term nation-state.

e) In modern times there is one-to-one bond between nation and state.

f) Therefore, in present we can define state as a community that has succeeded in acquiring a state of its own.

g) In Modern era nation is the most accepted justification for a state and people ask the ultimate source of legitimacy of the nation.