It also lets you know whether you have any mutual friends or shared interests on Facebook. Tinder is free to download and use, though there are some paid add-ons including the Tinder Plus subscription.
If you like the look of someone, you simply swipe right. It's only available for i Phone or Android (there's no browser version available).
Tinder matches couples based on their physical attraction to one another, so there are none of those aforementioned relationship questionnaires and there's no deep understanding of your personality.
Instead, you'll see other Tinder users who fall within a specified age range and gender, and are within a certain distance of your location.
20 years ago, the idea of online dating came to fruition when launched its first website.
Fast forward to the present day and online dating is one of the most popular ways of meeting new people, with millions of people using dating apps and websites every day.
It's i OS-only for now, but you can sign up to find out when the Android version arrives.
There are many dating sites with different types of people and not all dating sites are necessarily right for you.
These numbers, estimates as they are by the UN and other bodies, are almost certainly wrong. Full links and data are available for download below.
That does mean that matches might not be quite so perfect, but it won't cost you a penny to start using it.
You can choose to sign up for the paid-for subscription to get more insight into who likes you, browse invisibly, use advanced search options and see if your match has read your messages. We like the thinking behind Happn, a dating app that matches you with other users you've crossed paths with, whether it's on the way to work on in your favourite café.
This is the key data to see how each country contrasts.
Click the image below to enlarge it • Download the data • More data journalism and data visualisations from the Guardian It's certainly not comparing like with like: North Korea is a small, impoverished and isolated country; South Korea is wealthy and backed by the world's number one superpower.