Internet Explorer (IE), once a dominant web browser, has seen a significant decline due to various factors leading to its official discontinuation by Microsoft, with support ending for IE 11 on Microsoft products by 2021. The decline began with Microsoft's shift towards its newer browser, Microsoft Edge, and was exacerbated by IE's failure to keep up with new web standards and features, causing developers to abandon it in favor of more modern browsers like Chrome and Firefox. Despite holding a small market share, IE remains relevant to some users, particularly those using older systems, which has kept it on the radar for cross-browser compatibility testing. The introduction of progressive enhancement techniques has allowed developers to maintain basic functionality on IE while focusing on more advanced features for other browsers, highlighting IE's struggle to remain competitive in a rapidly evolving technological landscape. As Microsoft continues to develop Edge and transition users away from IE, the future of IE appears bleak, with its legacy likely to fade as it is replaced by more robust and efficient solutions.