When you are getting ready to do a job you always try to make sure that you have the best tools for that particular job. For example, if you are a person who builds houses then you make sure that you have a ruler, a hammer and a couple of other necessities to make sure that the job is done right. When you are a person who works in an office then you make sure that you have a working computer and paper for printing important documents. In the world of a hacker, they must make sure that they have all of the right tools as well. And usually one of those tools is a decompiler.
What is a decompiler?
A decompiler can come in many different forms. It really all depends on what you are working on. Some decompilers work in breaking down network traffic. Others work on mobile phone apps. But mostly when we are talking about a decompiler, we are talking about an app that you use to break down a piece of software. You are reverse engineering the work that was done on the original program. Most of the time when you are breaking this information down it is in the form of the lowest level of language available on the system. Well at least the lowest level of human readable language on the computer. On most systems the language that it breaks it down to is in some form of Assembly language.
Why is it needed?
Both the good guys and the bad guys need these tools to be able to do their job. When you are a bad guy you need a tool like this to be able to find holes in the software to attack. When you are a good guy you need the tool to be able to read malicious code and see what it is trying to do. This is the way that you are able to stop the affects of the attack.
Decompilers are very useful tools and one that is usually irreplaceable to a hacker.