An ascending trend channel is a basic chart pattern used in technical analysis.
Ascending trend channels are a useful tool due to their ability to predict overall changes in trend. As long as prices remain within the ascending trend channel, the upward trend in price can be expected to continue. As soon as prices exceed either trendline forming the channel, however, a strong signal either to buy or to sell is generated. A break through the upper trendline generates a strong buy signal, while a break through the lower trendline generates a strong sell signal.