Across CFDs, forex pairs, indices and commodities behave differently. Forex CFDs trade nearly 24 hours on weekdays with major pairs generally liquid; volatility often clusters around economic releases. Index CFDs track a basket of shares and tend to follow exchange hours, with gaps possible at the open. Commodity CFDs such as gold or oil can be sensitive to supply, geopolitics and the US dollar, sometimes with sharp moves. Trading hours and typical volatility vary by instrument.