Vivísimo is a privately hel enterprise search software company in Pittsburgh that develops and sells software products to improve search on the web and in enterprises. The focus of Vivísimo's research thus far has been the concept of clustering search results based on topic; for example, dividing the results of a search for "cell" into groups like "biology," "battery," and "prison." This process allows users to intuitively narrow their search results to a particular category or browse through related fields of information, and seeks to avoid the "overload" problem of sorting through too many results.