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A line chart is a type of graph that displays information as a series of data points called ‘markers’ connected by straight line segments. It is often used to visualize trends over time, allowing viewers to quickly see how values change. Typically, the x-axis represents the independent variable (like time), while the y-axis represents the dependent variable. Line charts can effectively illustrate data trends and variations, making them useful for analyzing patterns in various fields such as finance, science, and business.