The Occupational Information Network (O*NET) is a free online database that contains thousands of occupational definitions to help match job seekers with jobs. It was "developed under the sponsorship of the US Department of Labor/Employment and Training Administration (USDOL/ETA) through a grant to the North Carolina Employment Security Commission" during the 1990s.John L. Holland's vocational model, often referred to as the Holland Codes, is used in the "Interests" section of the O*NET.

From 1938 to the 1990s, vocational lists and employment matching offered by the U.S. government were available through the book, The Dictionary of Occupational Titles or the DOT. The DOT was first published in 1938 and "emerged in an industrial economy and emphasized blue-collar jobs. Updated periodically, the DOT provided useful occupational information for many years. But its usefulness waned as the economy shifted toward information and services and away from heavy industry." With the shift in the economy, plans developed to replace the book format of the DOT with an online database. A limited use, preliminary version was released in December 1997, followed by a public edition in December 1998. The O*NET thus, "supersedes the seventy-year-old Dictionary of Occupational Titles with current information that can be accessed online or through a variety of public and private sector career and labor market information systems." The decision to move from the DOT to O*NET, "remains controversial (e.g., Gibson, Harvey, & Harris, 2007; Harvey, 2009; Harvey & Hollander, 2002), even as we approach the 20-year anniversary of its inception (e.g., APDOT, 1992). Many applied psychologists have praised O*NET (e.g., Peterson, Mumford, Borman, Jeanneret, Fleishman, Levin, Campion, Mayfield, Morgeson, Pearlman, Gowing, Lancaster, Silver, & Dye, 2001)."