OllyDbg is a popular debugger for Windows applications, primarily used for reverse engineering and analyzing executable files. It provides a user-friendly interface that allows users to inspect the code, set breakpoints, and monitor the execution of programs. This makes it a valuable tool for software developers and security researchers. Designed for 32-bit applications, OllyDbg focuses on binary code analysis without requiring source code. It supports various features like disassembly, memory editing, and plugin integration, enhancing its functionality. Overall, OllyDbg is widely recognized for its effectiveness in debugging and understanding complex software behavior.