Introduction to Technical Analysis Bar Charts Bar charts are the most widely used type of chart.
Bar charts are popular because they are easy to construct and understand.
These charts are constructed by representing each day's, week's or month's activity as a vertical bar. Opening and closing prices are represented by horizontal marks to the left and right respectively. Spotting patterns and the trend of a market, two of the essentials of chart reading, are often easiest using bar charts. Daily bar chart of Apple Computer. Chart created using MacChart from Trendsetter Software.