Coding challenges are tasks or problems designed to test a programmer's skills in writing code. These challenges can vary in difficulty, from simple exercises that help beginners learn the basics of programming to complex problems that require advanced algorithms and data structures. They are often used in coding competitions, interviews, and online platforms to assess a developer's problem-solving abilities. Participants can solve coding challenges in various programming languages, such as Python, Java, or C++. Many websites, like LeetCode and HackerRank, offer a wide range of challenges, allowing users to practice and improve their coding skills while also competing with others in a fun and engaging way.