A hacker, in the context of programming, is an individual who uses their technical skills to explore and manipulate computer systems and networks. Hackers can be categorized into different types, such as white hat hackers, who work to improve security, and black hat hackers, who exploit vulnerabilities for malicious purposes. Their expertise often involves coding, problem-solving, and understanding how software and hardware interact. While hackers are often associated with illegal activities, many contribute positively to the tech community. They may participate in hackathons, collaborate on open-source projects, or help organizations identify and fix security flaws. Overall, hackers play a significant role in shaping the digital landscape.