Other sites target highly specific demographics based on features like shared interests, location, religion, sexual orientation or relationship type.

The 2016 Pew Research Center's survey reveals that the usage of online dating sites by American adults increased from 9% in 2013, to 12% in 2015.

Further, during this period, the usage among 18- to 24-year-olds tripled, while that among 55- to 65-year-olds doubled.

A great diversity of online dating services currently exists (see Comparison of online dating services).

Some have a broad membership base of diverse users looking for many different types of relationships.

Such companies offer a wide variety of unmoderated matchmaking services, most of which are profile-based.

Online dating services allow users to become "members" by creating a profile and uploading personal information including (but not limited to) age, gender, sexual orientation, location, and appearance.

Most services also encourage members to add photos or videos to their profile.

Once a profile has been created, members can view the profiles of other members of the service, using the visible profile information to decide whether or not to initiate contact.

Online dating (or Internet dating) is a system that enables people to find and introduce themselves to new personal connections over the Internet, usually with the goal of developing personal, romantic, or sexual relationships.

An online dating service is a company that provides specific mechanisms (generally websites or applications) for online dating through the use of Internet-connected personal computers or mobile devices.

Introduction sites differ from the traditional online dating model, and attracted a large number of users and significant investor interest.