It depends on the broker.
Besides, here are different types of the brokers (and the real accounts are not connected to the real market on some brokers).
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I am uploading few videos just for some information -
Why Choosing a Forex Broker is so Confusing
Learn how to sort through the chaos and confusion on the web to learn what forex brokers are best for individual currency traders.
What forex traders need to consider regarding the regulatory environment of the forex broker they trade with.
A look at the transaction costs involved in forex trading (the bid ask spread, commissions, and how trades are executed) so that FX traders can properly understand how much their currency broker is charging them.

- www.metatrader5.com
Hi Trades,
Are all these demo accounts working on real market´s intereactions, or all of them fake?
Thanks and best regards,
Antonio
And this video will give you idea about which live/real account is connected with the real market, and which one - not.
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Forex Broker Types - MM,NDD,STP,ECN
This is small 10 minute education video about the following: the difference between Forex Broker Types - MM,NDD,STP,ECN
Hi Trades,
Are all these demo accounts working on real market´s intereactions, or all of them fake?
Thanks and best regards,
Antonio
Thanks a lot for your good advise Sergey!

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Hi Trades,
Are all these demo accounts working on real market´s intereactions, or all of them fake?
Thanks and best regards,
Antonio