It launched in 1995 and is now available in 24 different countries.
Members set up a profile, upload photos and can then search through profiles to find a good match.
Launched in 2004, OKCupid works with many populations of people.
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Some mobile apps will match you with people based on criteria, including age, gender, and geographic proximity.
More traditional sites may offer anything from a simple search to a highly specific advanced search.
Chemistry, a dating site that is part of Match.com, is designed for people who are seeking help in getting to know someone online before meeting them for the first time.
It has over 8 million users on its online database.
It was originally a service called Just Say Hi, but the site transitioned to Mingle2 in 2008 and now works with many populations of singles.