The advantage of Forex markets is that you can trade 24 hours, 5 days a week. Trading begins on Sunday an hour before midnight, local time, when the market opens in New Zealand, followed by Australia, Tokyo, Hong Kong, Singapore and Dubai. Before these markets close the European markets open; and before the European markets close, the US market opens from 14:30 to 22:00. Then the New Zealand market opens and so on.
The information from the United States market has the most impact on others. That is why the highest number of participants on the market is during its working hours. Because of this, the opening of the US markets at 14:30 sees the greatest activity during the day.