CFDs are a leverage product and can involve a significant risk of loss. Trading CFDs may not be suitable for all, therefore you should ensure that you understand the risks involved and take into account your individual circumstances.
Trader's Glossary

Trend Line

Trend lines are drawn beneath uptrends and above downtrends to mark their respective support and resistance levels. Unlike regular support and resistance lines they are drawn diagonally across low points in an uptrend to indicate support levels and along high points in a downtrend to indicate resistance levels. When they are broken the prevailing trend is thought to be over.