Cookies are small text files that track users' movements on the Web.
Persistent cookies remain on a user's computer for a long period of time. Session cookies expire once a user closes the Web browser. DOT has more than 230 Web sites containing almost 202,000 Web pages and data files. The IG discovered cookie violations at Web sites operated by multiple DOT agencies, including the Federal Aviation Administration, the Federal Highway Administration and the Federal Railroad Administration. This is a labor-intensive process.