Ghidra is a reverse engineering software tool designed to help developers analyze and understand unknown software or malware. It provides a range of tools for reverse engineering, including disassembling and decompiling code, analyzing data structures and control flow, and searching through code for specific patterns or functions. It is used primarily by security researchers, exploit developers, and software developers for a variety of purposes, including identifying security vulnerabilities, debugging software, and developing custom software tools. Mastery of Ghidra requires a strong background in computer science and software development, as well as experience with reverse engineering and security research.