The term utopia has a greater depth that society shows. To understand the concept deeply we are going to focus on its definition and usefulness.
Utopia is a theorization about how a society, state, community or part of them should be organized in a perfect way without necessary define a plan or a way to perform it.
We could define An utopia as a society which has defined powers who work perfectly, as a Platon´s way of thinking: Military, Politics and Production system.