Yes. A demo account lets you try MetaTrader 5 (MT5) and practise trading with virtual money. Your own money isn't at risk.
You choose the virtual balance when you open a demo account; it starts at 5,000. A demo account runs for 30 days. See 'How do I open a demo account?'
Trading on a live account is different, because your own money is at risk.
Risk warning: CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. Only trade with money you can afford to lose.