Microsoft Edge (or simply nicknamed Edge) is a proprietary cross-platform web browser created by Microsoft. Released in 2015 along with both Windows 10 and Xbox One, it was initially built with Microsoft's own proprietary browser engine, EdgeHTML, and their Chakra JavaScript engine. Later on, it was ported to Android and iOS as a fork of Google's Chromium open-source project. In late 2018, Microsoft announced it would completely rebuild Edge as a Chromium-based browser with Blink and V8 engines, which allowed the browser to be ported to macOS. The new Edge was publicly released in January 2020, and on Xbox platforms in 2021. Microsoft has since terminated security support for the original browser (now referred to as Microsoft Edge Legacy). Edge is also available on older Windows versions until early 2023, as well as Linux.

Although it was created as the successor to Internet Explorer (IE), Internet Explorer 11 remained available alongside Edge for compatibility until 2023, when it was removed. In Windows 11, Edge is the only browser available from Microsoft (for compatibility with Google Chrome). However, it includes an "Internet Explorer mode," aimed at fixing compatibility issues; it provides the legacy MSHTML browser engine and supports the legacy ActiveX and BHO technologies.

In February 2023, according to StatCounter, Microsoft Edge became the third most popular browser in the world, behind Apple Safari and Chrome, while as of December 2023 Edge is second most popular PC/desktop web browser with Safari sliding to 3rd place. In the United States, Edge is the third most popular, where it has a 14% share, slightly behind Safari's 16% share. As of September 2022, Edge is used by 11% of PCs worldwide.