Trend chart is a commonly used graphic representation of data, which helps people to better understand the changes of data by showing the changing trend of data over a period of time. Trend charts are usually drawn in the form of line charts or graphs, with abscissa indicating time and ordinate indicating collected data, such as sales volume, stock price and temperature. Trend chart can not only reflect the changing trend of data, but also reveal the periodic laws and characteristics of data, so that people can have a deeper understanding of the development trend of data.

Trend charts are widely used in business, finance, scientific research, environment and other fields. In the commercial field, trend charts are generally used to analyze the changing trends of sales volume, market share and other indicators to help enterprises understand the development of the market. In the financial field, trend charts are widely used to analyze and predict the prices of stocks, exchange rates, futures and other assets. In the fields of scientific research and environment, trend charts are mainly used to analyze the changing trends of temperature, rainfall, gas concentration and other indicators, so as to formulate corresponding coping strategies and measures.

The function of trend chart is not only to present the changing trend of data, but more importantly, to help people deeply understand the nature of data and tap the potential laws behind data, so as to make more accurate predictions and judgments. Therefore, it is of great significance for people to correctly understand and use the data to master the drawing and analysis methods of trend charts. With the development of digital technology and the rise of data science, trend chart will play an increasingly important role in future application and research.