A price chart is a sequence of prices plotted over a specific time frame. In statistical terms, charts are referred to as time series plots.
On a chart, the y-axis (vertical axis) represents the price scale and the x-axis (horizontal axis) represents the time scale. Prices are plotted from left to right across the x-axis with the most recent plot being the furthest right.
Technical analysts and chartists use charts to analyze a wide array of securities and forecast future price movements. The use of charts is not limited to just technical analysis, however. Fundamental analysts can benefit from their use as well. A graphical historical record makes it easy to spot the effect of key events on a security's price and its performance over a period of time. 
- What Are Charts?. StockCharts.com.