JSLint is a static code analysis tool designed to identify potential problems in JavaScript code. Created by Douglas Crockford, it helps developers write cleaner and more reliable code by enforcing a set of coding conventions and best practices. By analyzing the code, JSLint can flag issues such as syntax errors, potential bugs, and stylistic inconsistencies. Using JSLint is straightforward; developers can paste their JavaScript code into the tool, and it will provide feedback on any detected issues. This helps improve code quality and maintainability, making it a valuable resource for both novice and experienced programmers.