It was founded in 1994 as a research project at Telenor( the largest Norwegian telecommunications company).in 1995 it became an independent company named opera software ASA,Opera was first released publicly with version 2.0 in 1996,which only work on windows (1995)
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how it is used,or why is it use it instead of others

Some people prefers to use opera instead of Firefox or chrome, even some companies prefer to use opera browser, why? maybe because It is possible to control some aspects of the browser like page zooming allows text, images and other content such as adobe flash player and java platform.

how is it changing lives

by its privacy policy when visiting a site, Opera displays a security badge in the address bar which shows details about the website, including security certificates.The browser checks the website that is being visited against blacklists for malware, and displays a warning page if it matches any of these lists.