K-line charts (Candlestick Charts) are also called candle charts, Japanese lines, Yin-Yang lines, stick lines, red and black lines, etc. The commonly used term is "K-line".

K-line chart [1] is a type of technical analysis. It was first created by the Japanese in the 19th century and originated from the rice market during the Tokugawa Shogunate era (1603-1867) in Japan in the 18th century. Trading is used to calculate the daily rise and fall of rice prices. It was used by merchants in the Japanese rice market at that time to record the market conditions and price fluctuations of the rice market, including the opening price, closing price, highest price and lowest price. The white candlestick represents the rising market on that day. A black candlestick represents a falling market. This kind of chart analysis method was particularly popular in China and even the entire Southeast Asia region at that time. Because the shape of the chart drawn by this method is quite like a candle, and these candles are black and white, it is also called a Yin and Yang line chart. Through the K-line chart, people can completely record the market performance of each day or a certain period. After a period of trading, the stock price will form a special area or pattern on the chart. Different forms show different meanings. We can find out some regular things from these changes in form.

K-line chart patterns can be divided into reversal patterns, consolidation patterns, gaps and trend lines, etc. The post-K line chart was introduced to the stock market and futures market because of its delicate and unique marking method.

The K-line chart in the stock market and futures market contains four data, namely the opening price, the highest price, the lowest price, and the closing price. All K-lines are centered around these four data. Status and price information that reflects the general trend. If you put the daily K-line chart on a piece of paper, you can get the daily K-line chart. You can also draw the weekly K-line chart and the monthly K-line chart.