Equivalent Partitioning (Black Box Testing Type)

What is Equivalent partitioning?

Equivalent partitioning is the process of classifying all the test cases into classes an to pick one test value from each class while testing. It is used to reduce the number of test cases to a limited set such that all input and output values are covered.
For Example: If a given input box attends only numbers from 1 to 100, there is no point is trying out all the values. You can classify the input into 5 cases.
1. A value at the lesser than the lower boundary Ex: -1 etc
2. A value equal to the lesser boundary i.e. 1
3. A value in between 1 and 100
4. A value equal to higher boundary i.e. 100
5. A value greater than the higher boundary , i.e. 101