Obfuscated code is software that is intentionally written to be hard to read, understand, or analyze. It may use confusing variable names, dense one-line expressions, unusual control flow, string encoding, or layers of indirection to hide what the program really does. In security work, that matters because readability supports trust: when code is easy to inspect, reviewers can spot logic errors, unsafe memory handling, and hidden functionality more quickly.
Obfuscation appears in both defense and attack. Developers sometimes obfuscate legitimate software to slow reverse engineering or protect intellectual property, while attackers use it to conceal malware behavior, evade static analysis, and delay detection by analysts. Security teams respond with code review, static analysis, sandboxing, and reverse engineering, but heavily obfuscated code raises the cost and expertise needed to validate it. The key lesson is that obscurity is not a security control by itself; clear, reviewable design is usually safer and easier to defend.