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Source : http://www.investopedia.com/terms/o/oscillator.asp
Oscillator
This is a trend indicator for discovering short-term overbought or oversold conditions. As the value of the oscillator approaches the upper extreme value the asset is deemed to be overbought, and as it approaches the lower extreme it is deemed to be oversold.
Oscillators are most advantageous when a clear trend cannot be easily seen in a company's stock such as when it trades horizontally or sideways.
Please see attached
Oscillator
This is a trend indicator for discovering short-term overbought or oversold conditions. As the value of the oscillator approaches the upper extreme value the asset is deemed to be overbought, and as it approaches the lower extreme it is deemed to be oversold.
Oscillators are most advantageous when a clear trend cannot be easily seen in a company's stock such as when it trades horizontally or sideways.
Please see attached