Online dating or Internet dating is a dating system which allows individuals, couples and groups to make contact and communicate with each other over the Internet, usually with the objective of developing a personal romantic or sexual relationship. Online dating services usually provide unmoderated matchmaking over the Internet, through the use of personal computers or cell phones.

Online dating services generally require a prospective member to provide personal information, before they can search the service provider's database for other individuals using criteria they set, such as age range, gender and location. Most sites allow members to upload photos of themselves and browse the photos of others. Sites may offer additional services, such as webcasts, online chat, telephone chat (VOIP), and message boards. Some sites provide free registration, but may offer services which require a monthly fee. Other sites depend on advertising for their revenue.

Many sites are broad-based, with members coming from a variety of backgrounds looking for different types of relationships. Other sites are more specific, based on the type of members, interests, location, or relationship desired.

Trends

United States residents spent $469.5 million on online dating and personals in 2004, and over $500 million in 2005, the largest segment of “paid content” on the web other than pornography, according to a study conducted by the Online Publishers Association (OPA) and comScore Networks.

At the end of November 2004, there were 844 lifestyle and dating sites, a 38 percent increase since the start of the year, according to Hitwise Inc. However, market share was increasingly being dominated by several large commercial services, including Yahoo! Personals, Match.com, and eHarmony.

In 2002, a Wired magazine article forecast that, "Twenty years from now, the idea that someone looking for love without looking for it online will be silly, akin to skipping the card catalog to instead wander the stacks because 'the right books are found only by accident.' Serendipity is the hallmark of inefficient markets, and the marketplace of love, like it or not, is becoming more efficient".

Most recently, it has become common for online dating websites to provide webcam chats between members. In addition, as the online dating population becomes larger, sites with specific demographics are becoming more popular as a way to narrow the pool of potential matches. According to online personals expert Mark Brooks from onlinepersonalswatch.com, online dating sites are adding features including handwriting analysis to match like-minded mates.

The most successful niche sites pair people by race, sexual orientation or religion. The 20 most popular dating sites this year as ranked by Hitwise include JDate (for Jewish singles), Christian Mingle and Christian Cafe, Manhunt (for gay men), Love From India, Black Christian People Meet, Amigos (for Latino singles), Asian People Meet, and Shaadi (for Indian singles). In March 2008, the top 5 overall sites held 7% less market share than they did one year ago while the top sites from the top five major niche dating categories made considerable gains.