HTML validation is the process of checking a web page s HTML code against established standards set by the World Wide Web Consortium (W3C) or other governing bodies. This process helps identify errors, deprecated tags, and structural issues that could affect how browsers interpret and display the page. By ensuring that HTML code is valid, developers can improve website compatibility, accessibility, and overall performance across different devices and browsers. Validation is typically performed using online tools or integrated development environment (IDE) plugins that analyze the code and provide feedback for corrections.