Ecosia

Ecosia is a search engine based in Berlin, Germany. Its profits are mainly given to nonprofit organizations for replanting trees. 
The description of the company show it is a social business. It keeps information about users safe. In April 2021, the company claims to have fully planted 124 million trees around the world.
Search Engine.
When the company was created, it used Yahoo!, Bing, and Wikimedia's technology. Yahoo! served as advertisements. Ecosia now uses Bing as its search provider. Soon in 2018, Ecosia said it would be privacy-friendly search engine. In the Privacy Policy it statest that it would not permanently store data or use tracking services. When a search is made to a partnered website, a Euro is donated to tree replant services.
History.
Ecosia was officially launched on December 7, 2009 as a search engine to plant and replant trees. By 2011, €250,000 was raised. Ecosia spent it funds in 2014 donating to the Plant a Billion Tress program. On January 23, 2020, Ecosia spent all of its funds to ReForestNow.
Extension.
Google Chrome, Firefox, Safari, Microsoft Edge, and a few other browsers have the Ecosia extension that allows it to become the default search engine. Ecosia is available as an app for Android and iOS.