Well, the answer is uncomplicated. It the same reason that the internet in whole became so popular.

Internet technologies released a new world of communications between people.

These New Media benefits include:

Speed

Try to remember the old system of personal ads for singles in a newspaper. In those days, a single person had to reply to mailing address to answer and personal ad and then wait for days for the other person to get the letter. The second person would then take days to respond

These days, by using e-mail systems, singles can contact each other in a matter of a few minutes. And, even in real time, when using a Instant messaging service.

Online dating websites provides for total privacy and security. You can communication with another person in the privacy of your home.  And with profile images and video, you can see and hear just what looks  and sounds like with having to go on a date blindly.

Internet dating provides the option of being able to view thousands on singles in your area, while being able to sort and filter only the ones you’re interested in. There are even niche dating sites for specific interests, like a particular religion. 

You can then see, talk, and listen to the person’s voice, before you commit to meeting them in real life.

The best part about online dating is that it affordable. Although you do have to pay a monthly membership to be able to contact other singles on most sites, the fee is only a fraction of what you pay going to clubs or on a singles cruise, trying to meet other singles.