Explain the main purpose for the amendment process. why is it important to do it this way?

The amendment process is to clarify or alter the United States Constitution. It requires a two-thirds vote in both the Senate and the House of Representatives or a two-thirds vote in a convention by the states. Either of which is hard to have done. It is done this way to Make sure that any amendments done to the constitution have an overwhelming majority of people in support of it. 

Some examples whereas the United States Constitution clarifies "We the People" are in amendments 13, 15, and 19. These do not change the effect of the Constitution, it only makes clear that it applies to everyone, regardless of gender or race. 

Some examples whereas the United States Constitution is altered is in many other amendments such as term limits like in the 20th amendment.