中文：

K线是一种金融市场分析工具，用于表示股票、期货或其他金融产品的价格波动和交易情况。K线也被称为蜡烛图，因为它在图形上呈现出一个类似蜡烛的形象。

K线由一根垂直线和一根水平线组成，垂直线表示价格波动的大小，水平线则表示交易的日期或时间。在K线图中，每个K线代表一个交易时间段的价格波动情况，包括开盘价、收盘价、最高价、最低价等。

通过观察K线图，投资者可以了解股票或其他金融产品的历史价格走势和交易情况，从而做出更明智的投资决策。K线图通常与移动平均线、相对强弱指数等技术指标结合使用，以便更准确地预测价格趋势和买卖时机。

K线图不仅在股票和期货市场得到广泛应用，还被广泛应用于其他金融领域，如外汇、黄金等。通过K线图，投资者可以更好地理解市场动态和价格走势，从而做出更明智的投资决策。

总的来说，K线是一种重要的金融市场分析工具，可以帮助投资者更好地理解市场动态和价格走势，从而做出更明智的投资决策。

英文：

K-line is a financial market analysis tool used to represent the price fluctuations and trading conditions of stocks, futures, or other financial products. It is also known as candlestick chart because it appears similar to a candlestick in a graphical sense.

A K-line consists of a vertical line and a horizontal line. The vertical line represents the size of the price fluctuation, while the horizontal line represents the date or time of the transaction. In a K-line chart, each K-line represents the price fluctuation during a trading period, including opening price, closing price, high price, and low price.

By observing the K-line chart, investors can understand the historical price trend and trading conditions of stocks or other financial products, making more informed investment decisions. K-line charts are often used in combination with technical indicators such as moving averages, relative strength index, etc., to predict price trends and buy/sell opportunities more accurately.

K-line charts are widely used not only in stock and futures markets but also in other financial fields such as foreign exchange, gold, etc. By using K-line charts, investors can better understand market dynamics and price trends and make more informed investment decisions.

In summary, K-line is an important financial market analysis tool that helps investors better understand market dynamics and price trends and make more informed investment decisions.