When you search using Bing, Microsoft collects the search terms you provide, along with other information, such as your IP address and location, the unique identifiers contained in our cookies, the time and date of your search, and your browser configuration.

Like other search engines, Bing uses your web search history to improve your search experience by showing you suggestions as you type, providing personalized results, and more.

The Bing search history keeps a record of the things that you search online. This way, Bing can recommend similar sites and previous search results for a better searching experience. You can disable this feature by following the steps provided on this Link.

Bing does this for a number of reasons – the main one is personalizing your experience and serving the search results that are most relevant to you. However, search history is also used to target adverts at users with a higher degree of personalization.