Whether you're a Bing user or someone who occasionally cross-checks search results, you might have noticed the "Deep search" button. This button is your gateway to a more comprehensive search experience. 

Microsoft is obviously big on pushing Copilot through search right now, but here's what this possibly mysterious button does and whether it's something you should use.

Bing Deep Search is another way to search on Microsoft's search engine. The feature uses generative AI, leveraging OpenAI GPT-4 and the Bing database index to answer more complex questions than a simple search query. 

The functionality isn't entirely new. It was first unveiled in December 2023. It was available to some users in February 2024, but then the company pulled it out, and then, in March, the feature was back, and now it's available for anyone. 

https://www.windowscentral.com/software-apps/bing/what-is-bing-deep-search-and-why-should-you-use-it