Realism
is one of the many schools of thought that are particular to the international
relations theory. Realism is seen as a very diverse in its thoughts, though
they are undivided in the belief of international politics is conclusively,
constantly and needed an area for conflict for those actors seeking power.

Realist can normally fall into three categories of which they think the source
of conflicts come from. The first is classical realists, who believe that the
conflict stems from human nature, while neorealist believe that it originates
in the composition of an anarchic state system, and finally neoclassical
realists think that it is due to a combination of both with added domestic variables.

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In addition, some realist debate about the action that should be taken by
states whilst manoeuvring through world politics, this divides them into
defensive realism and offensive realism. Furthermore, there particularly
ideology is on that is evident throughout the history of political thought these
include people such as Machiavelli, Thomas Hobbes, Kautilya and Thucydides.