About repeat group

hello every one,
mostly i hear about repeat group in this community, is here any one to explain what is repeat group and what it used for?
thanks

It's a group of questions you can add/repeat many times. For example, you may want to collect countries and their states, so you can build a form where you have one text question Country Name and repeat group that contains one text question State Name. Thanks to that you can add:
Country Name: USA
State Name: and 50 states

There is a form called Biggest N of Set available on the demo server you can download and test.

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Could you please post the URL of the demo server, or some instructions on how to reference the server? Thanks.

It's https://opendatakit.appspot.com/ if you download ODK Collect that url is used by default.