It is a way of describing/depicting the movements of the currency pairs over time. Virtually all charting packages will offer the three primary ways to view price action. The price movement can be represented by either candlesticks, bars or lines...check the three examples below. (The line chart does not have the 200 SMA, the green line, on it.)
Candlestick charts are far and away the most widely used charting format as they provide all the key pieces of price information (high, low, open and close), and are depicted and in such a way as they can be identified in glance.
Should you want to learn more about candlestick interpretation, you can do either of the following:
If you have a live trading account you can go directly to the four lessons on Candlestick Patterns in the course by logging into DailyFX+...www.dailyfxplus.com... and using your live account number and live account password as your username and password to log in. Then scroll down until you see Candlestick Patterns along the left hand side and click on it.
If you don't have a live account but would like to view the course offerings along with these lessons on candlesticks on a temporary basis, click on this link and you can register for a temporary course login...