Search engines also are able to retain user information, such as location and time spent using the search engine, for up to ninety days. Most search engine operators use the data to get a sense of which needs must be met in certain areas of their field. People working in the legal field are also allowed to use information collected from these search engine websites. The Google search engine is given as an example of a search engine that retains the information entered for a period of three-fourths of a year before it becomes obsolete for public usage. Yahoo! follows in the footsteps of Google in the sense that it also deletes user information after a period of ninety days. Other search engines such as Ask! search engine has promoted a tool of "AskEraser" which essentially takes away personal information when requested.