Also see Resistance and Trendlines. The more points connected, the stronger the trend, and the more significant an eventual breakout. Trendlines usually show levels of Support and Resistance. Looking at the slope of the trendline, a succession of lower price valleys is a bearish. Used in constructing Keltner Bands.
Volume is the number of shares or contracts traded during a given time frame - often one day.
Volume confirms the price trend when it increases with an uptrend and decreases with a downtrend. Volume changes often precede price changes. As volume increases, prices usually also increase.