The Bing Web Search API returns a list of relevant results from a search query which may include images, videos, and news. Results can be customized with functionality such as safe-search level, spelling suggestions, related queries, and location based results. This API provides a list of results similar to the "Bing.com/Search" site, but the experience is not exact, and the individual results must be displayed in the same order of the response. Currently, a free plan that limits calls to 1000 transactions per month is available. The Web Search API uses JSON format for data exchange, and API Keys for authentication.