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

What is Oscillator?

In technical analysis, technical indicators that operate by plotting the output of a trend indicator between two extreme values are called oscillators. Oscillators are employed by traders to identify overbought and oversold conditions.