What was the last version of Internet Explorer?

The last version of Internet Explorer was Internet Explorer 11.

Microsoft released Internet Explorer 11 in 2013, first bundling it with Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2. It later became available for Windows 7 and Windows Server 2008 R2.

Internet Explorer 11 followed Internet Explorer 10 and was the final numbered release of Microsoft's long-running browser. Microsoft Edge became the company's modern default browser, while IE11 remained available mainly for older websites and enterprise compatibility.

Internet Explorer 12 was never released as a finished browser. The browser was eventually retired on many Windows versions, but Internet Explorer technology survives in Microsoft Edge's Internet Explorer mode for legacy sites.