Online dating is about finding who you are and what others are.
It helps you interact with potential match online and eventually leads to offline dating.
Some have a broad membership base of diverse users looking for many different types of relationships.
Other sites target highly specific demographics based on features like shared interests, location, religion, or relationship type.
Opinions and usage of online dating services also differ widely.
A 2005 study of data collected by the Pew Internet & American Life Project found that individuals are more likely to use an online dating service if they use the Internet for a greater number of tasks, and less likely to use such a service if they are trusting of others.
Overall, respondents preferred free sites like Ok Cupid, Tinder and Grindr over paid sites like Match and e Harmony, in part because of the value.
The now infamous infidelity dating site Ashley Madison, which was one of the most expensive, was also the lowest-scoring online dating service, with a score of 37.
It is an established matchmaking service with 13.5 million visits a month.
Online dating services also differ widely in their revenue streams.
Some sites are completely free and depend on advertising for revenue.
On Valentine's Day, some singles may be inspired to step up their dating game. Amy Giberson, now 34, was reluctant to try internet dating again but she decided to give it one more shot in 2014. There are a slew of sites and apps to help singles find love and, for the most part, they work, according to Consumer Reports.
She downloaded the Match app and connected with Justin Pounders, also 34, almost immediately. Nearly half, or 44 percent, of those who tried online dating said it led to a serious long-term relationship or marriage, the magazine found.
Online dating has become so popular that it is termed to be the second most common way to find true love or soul mate.