Which search engine introduced 'Google Instant' in 2010?

The search engine that introduced “Google Instant” in 2010 was Google.

Google launched Google Instant on September 8, 2010. The feature displayed search results while users were still typing, predicting the likely full query and updating the results page for that prediction. Google described it as a “search-before-you-type” experience designed to help people reach useful results more quickly.

Instant built on Google Suggest, the system that offered autocomplete predictions beneath the search box. Google estimated that the feature could save users between two and five seconds per search. It was initially rolled out in stages and was not identical to autocomplete: autocomplete suggested text, while Instant also refreshed the results page before the user finished entering the query.

The feature is often confused with Google Autocomplete or Instant Previews, which arrived later in 2010 and showed visual previews of result pages. Google Instant was primarily a search-interface innovation, not a new search engine or a ranking algorithm. Google later retired the desktop feature as search behavior shifted toward mobile devices.