To convert compiled code (like a program) back into a more readable source code format.
From de- (reverse) + compile (to convert source code into machine code). Created in computing during the 1970s as reverse-engineering became important.
Decompiling is a cat-and-mouse game in software security—hackers decompile programs to find vulnerabilities, while programmers use obfuscation to make decompiled code harder to understand.
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