Bar chart is a visual way to represent Open, High,Low, Closing pricing movements of the security.
A single bar has a vertical line, left horizontal tick and right horizontal tick.
Vertical line indicates the high-to-low price range.
Left horizontal tick shows open price.
Right horizontal tick shows closing price.
Bar charts help a trader/investor visualise bullish sentiment ( upward / uptrend price movement on chart ) or bearish sentiment( downward / downtrend price movement on chart ) by displaying bars using different colours.
A bullish bar is one in which the price has closed higher than it opened – the vertical line of such bar is usually represented in green.
A bearish bar is one in which price has opened lower than it opened – the vertical line such a bar is usually represented in red.
Difference between high price and low price is called range.