Yandex N.V.is a Russian multinational corporation providing Internet-related products and services, including transportation, search and information services, eCommerce, navigation, mobile applications, and online advertising.

Yandex traces its roots to 1990, when Arkady Volozh and Arkady Borkovsky founded Arkadia, a company that developed MS-DOS software for use in patents and goods classification. Their software featured a full-text search with Russian morphology support. In 1993, Arkadia became a subdivision of Comptek International, another company founded by Volozh in 1989.

Arkady Volozh

In the same year, Arkady Volozh and Ilya Segalovich, friends since their school days and by then working together to develop search software, invented the word "Yandex" to describe their search technologies. The name initially stood for "Yet Another iNDEXer"

Between 1993 and 1996, the company continued developing its search technologies and released software for searching the Bible. The Yandex.ru search engine was launched on September 23, 1997, and was presented at the Softool exhibition in Moscow. Initially, the search engine was developed by Comptek. In 2000, Yandex was incorporated as a standalone company by Arkady Volozh.

The firm primarily serves audiences in Russia and the Commonwealth of Independent States., and also has 18 commercial offices worldwide. The firm is the largest technology company in Russia and the largest search engine on the Internet in Russian, with a market share of over 52%.

It also has the largest market share of any search engine in Europe and the Commonwealth of Independent States and is in the top 10 largest search engine worldwide after Google, Baidu, Bing, and Yahoo!  According to Yandex, one of its biggest advantages for Russian-language users is the ability to recognize Russian inflection in search queries.

According to en.wikipedia and statista