Testing is part of trust. Just like, trust in a person is built with trials and tests. The same goes for computer software. Just as we have development teams. we have testing teams who use these API testing tools to qualify software as good and customer efficient before any user can use it.
Being trained to be a software developer, you should also make a habit of testing your software. It is a trait of a good software developer. Diving deep into this topic and discussing these tools, to help you understand the working of such tools and how you can use them, we will be giving talking about them.