What is the difference between Microsoft Edge and IE?

Microsoft Edge and Internet Explorer are fundamentally different web browsers from Microsoft, built on separate technological foundations and designed for distinct eras of computing. Internet Explorer (IE), culminating with version 11, is a legacy application tied to the Windows operating system's proprietary Trident (MSHTML) rendering engine. Its development effectively ceased years ago, and it exists today primarily as a compatibility solution for organizations reliant on outdated, proprietary web applications built for its specific behaviors. In stark contrast, Microsoft Edge is a modern, cross-platform browser built on the open-source Chromium project, which also underpins Google Chrome. This grants Edge access to the vast ecosystem of modern web standards, extensions, and performance enhancements driven by the broader Chromium community, positioning it as a tool for current and future web use rather than a bridge to the past.

The core divergence lies in their architecture and performance. Internet Explorer's Trident engine struggles with the complex JavaScript and CSS that define contemporary websites, leading to slower page loads, poorer responsiveness, and frequent security vulnerabilities due to its outdated codebase. Edge, leveraging Chromium's Blink engine and V8 JavaScript runtime, delivers performance and compatibility on par with other leading browsers. This modern foundation also enables robust security features like process isolation, advanced phishing protection, and regular automatic updates that IE lacks. Furthermore, Edge is a genuinely cross-platform product available on Windows, macOS, iOS, and Android, while IE was confined to Windows and officially abandoned on other platforms long ago.

Operationally, their roles within the IT landscape are opposites. Microsoft ended support for most versions of IE in June 2022, having long advised consumers and enterprises to transition to Edge. Edge includes a dedicated "Internet Explorer mode," which uses integrated IE engine components to render legacy intranet sites within a protected tab. This feature explicitly acknowledges IE's only remaining purpose: as a legacy compatibility layer contained within a modern, secure browser. Edge, meanwhile, is developed with a focus on productivity features like vertical tabs, collections, and immersive reading modes, and it actively competes on user experience rather than merely providing access to the web.

The implication is that these are not two comparable browsers from the same lineage but products serving entirely different functions. Internet Explorer is a deprecated piece of enterprise infrastructure, maintained for backward compatibility. Microsoft Edge is the company's strategic, forward-looking client for the modern web and cloud services. For any general user or new project, Edge is the unequivocal choice, as using IE for general browsing introduces significant security and compatibility risks. The continued presence of IE on some Windows systems is a concession to organizational technical debt, not an endorsement of its viability as a web browser.