X Blades Cdkey What Is The Purpose Of The Different X-acto Knife Blades?

What is the purpose of the different X-acto knife blades? - x blades cdkey

I had an X-Acto knife for a year. He came with different types of blades, the search for a place, circular, irregular, and the style of regular diagonal. The applications are very different for each blade? Or is it just a preference for the use of style sheets?