Nexus is a series of smartphones and tablets manufactured by Google and its hardware partners. Nexus devices run the native Android operating system.
Most Android devices run versions of the Android operating system that are modified with the manufacturer's own graphical user interface (GUI) such as HTC's Sense or Motorola's Motoblur. They also come pre-loaded with software applications (apps) chosen by the manufacturer and/or wireless carrier that users can't uninstall. Google Nexus devices, however, contain no modifications to Android and only apps developed by Google, such as Gmail and the Google Chrome browser are pre-installed. Unlike OS updates on other devices, which are left up to the discretion of the wireless carrier, Google delivers OS updates directly to Nexus devices,Content Continues Below
Examples of Google Nexus devices include the Samsung Galaxy Nexus smartphone and Asus' Nexus 7 tablet. The first Nexus smartphone was the HTC Nexus One, which debuted in 2010 and is no longer supported.