Opera is a web browser developed by Opera Software. The latest version is available for Microsoft Windows, OS X, and Linux operating systems, and uses the Blink layout engine. An earlier version using the Presto layout engine is still supported, and additionally runs on FreeBSD systems. Editions of Opera are available for devices running the Android,iOS, Symbian, Maemo, Bada, BlackBerry and Windows Mobile operating systems, and for Java ME capable devices.^[6][7]

According to Opera Software, the browser had more than 350 million users worldwide in the 4th quarter 2014.^[8] Total Opera mobile users reached 277 million in December 2014.^[8] Opera has been noted for originating many features later adopted by other web browsers. A prominent example is Speed Dial.^[9]