Demo trading is a convenient account where everything except money is real trading. You have a demanding balance sheet that goes up and down in trading gains and losses, just like the actual bill. This is a great way to see if you will win in real trades.
Free demo trading with multiple brokers and real-time trading and you can't tell the difference between demo and live accounts. You can also get information about demo trading app through the web.
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If you are not 100% sure that your strategy is working and you are disciplined enough to implement it then you are just playing and that is stupid. Anyone successful at anything in life spends time studying, studying, and improving their skills.
Professional athletes don't just reach the top, they have to move up the ranks and it takes years of practice. The same concept applies to forex trading.
Using a demo account will also help you familiarize yourself with the broker and trading platform before jumping in with real money. You should know the ins and outs of any broker before starting. It is important to understand how their stop loss and spread features work.
Demo trading shows you how this all works with any broker. When trading real money it is better to know how to trade and which buttons do what.