Day trading charts can be based upon several different criteria, with the most popular being time, ticks (number of trades), volume (number of contracts), and price range. All four types of charts use the same market information (price, volume, etc.), but they display the information slightly differently.
Range Charts
Charts based upon price range make a new price bar (or candlestick, line, etc.) every time the price has moved a specific distance. Popular short term price ranges are 5 ticks, and 10 ticks, and popular long term price ranges are 20 ticks, and 25 ticks. As price range based charts only make new bars when there has been enough price movement, they adjust to the market, making bars less often when the market is stuck in a small range (i.e. not moving). Some day traders believe that this gives range charts an advantage over time charts, but this really depends upon the trading system being used. Price range charts appear different from other types of charts, because each bar (or candlestick, line, etc.) has the same range (high - low), and therefore has the same size when displayed on the chart.
