Planning cannot be overemphasized in a country and state. A nation well planned will be developed and beautiful than unplanned nation.
However planning is defined as the application of rationale, logical and analytical reasoning on the pursuit of set objectives. Planning can either be physical,economic, development, indicative etc. these different types of planning in a nation is very important, what are they? Effective control of the national economy,avoidance of economic exploitation,adequate provision of facilities and public utility,well efficient utilization of resources, balanced distribution of public investment funds. Physically and economically people can testify how important planning is in all manners of life of a nation. Imagine the difference between developing and developed nation. Everyone want to live in a developed nation because is well planned and implemented. Implementation of these plans is very important also ,because what is the important of planning without implementation! For instance, Nigeria have different forms of plans but is not implemented due to political system in the country. Pictures below the importance of planning
Beautiful environment due to a well planned environment.
All these areas in the pictures are planned and the effect can be see and felt.
Proud to be a town planner
I remain 
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From @kdforlife