This document introduces the concept of trends in technical analysis. It defines an uptrend as a rising support level marked by successively higher low prices, with the bulls in control pushing prices higher. A downtrend is defined as a falling resistance level marked by successively lower high prices, with the bears in control pushing prices lower. Trends can be penetrated when investor expectations change, often seen through an increase in trading volume at the penetration point. Volume is a key indicator in determining the significance of a trend penetration.