JSHint is a static code analysis tool used to detect errors and potential problems in JavaScript code. It helps developers identify issues such as syntax errors, undeclared variables, and other common pitfalls that can lead to bugs. By providing feedback on code quality, JSHint encourages best practices and improves overall code maintainability. Developed by Anton Kovalyov, JSHint is highly configurable, allowing users to customize its rules according to their project's needs. It can be integrated into various development environments and build systems, making it a versatile tool for both individual developers and teams working on JavaScript applications.