By its nature charts present an image of changing price of financial instrument. Charts are the most used way for tracking the change of a price. Every element of technical analysis is based on usage of chart.
There are three types of charts offered on most trading platforms:
A line chart is made up of a series of dots connected in a horizontal line. When the dots are placed for every period of time, they are connected so that a line chart is made . So if we take a daily chart, the end of day price is joined to the next and so on until you see the line chart.
Here is an example of line chart for EUR/USD: