This is a web search engine named High Browse.
You can type a topic in the box and press Enter to see matching results from across the web.
The goal of High Browse isn't to answer factual questions but to surface new websites which relate to the search - sometimes tenuously, but occasionally serendipitously. It's more like a "surf engine" than search engine.
The index contains a handful of pages each from 30 million domains which were crawled during September to November 2022 (so it is a little out of date). When there are many matches for a search topic, just a random subset of them are searched. Results are ordered by how near the top of the page the search phrase appears. The servers run on 100% renewable energy.
Here are some examples to get started: