Online dating or Internet dating is a personal introductory system where individuals can find and contact each other over the Internet to arrange a date, usually with the objective of developing a personal, romantic, or sexual relationship.

Some sites provide free registration, but may offer services which require a monthly fee.

Other sites depend on advertising for their revenue.

In Germany government financed NGOs like "Verbraucherschutzzentrale" sometimes help to sue online dating sites.

This problem is referred to as "catfishing" in pop-culture and has been made famous by a popular MTV program called "Catfish the TV show".

Apart from the popular social networks, there are social websites meant just for meeting and talking to someone new.

3 popular and effective websites are: Plenty of Fish, Ok Cupid, and (where you can meet someone that has a similar taste in music as you).Some sites such as Ok Cupid.com, and are free and offer additional paid services in a freemium revenue model.Some sites are broad-based, with members coming from a variety of backgrounds looking for different types of relationships.At the end of November 2004, there were 844 lifestyle and dating sites, a 38% increase since the start of the year, according to Hitwise Inc. By 2007, many prominent studies show that Baby Boomer interest in online dating have soared.However, market share was increasingly growing by several large commercial services, including Personals. Some online dating websites provide webcam chats between members.Such sites earn revenue from a mix of advertising and sale of additional options.