A trendline is a line drawn from pivot to pivot and extends to the right, typically drawn under swing pivot lows or over swing pivot highs or to show the prevailing direction of the price trend.
Trendlines can be used on any timeframe and are a commonly used technical tool, to identify and forecast price trends by using past support and resistance zones to geometrically forecast potential trend price zones. Trendlines can be used to identify the direction and speed of the trends rate of change and are an integral part of many chart patterns.