The chart delivers an unbiased reading on a stock. On a bar chart, the price action will be shown as a cross hair. The vertical line shows the stock's range during that day, week or month. The horizontal hash mark indicates where a stock closed. At the bottom of an Investor's Business Daily chart you can find a stock's trading volume.
Volume is a key part of a stock's action.
Look at both daily and weekly charts. Daily charts give you a close-up view, and are especially helpful in spotting buy and sell points. Charts help put a stock's action in context. Likewise, a big point decline may look ugly on a chart, or just be a normal pullback in light volume. Many investors dismiss charts as meaningless.