2D Line Chart
From Grapheme wiki
A line chart is a type of chart which displays information as a series of data points connected by straight line segments. It is a basic type of chart common in many fields. It is similar to a scatter plot except that the measurement points are ordered (typically by their x-axis value) and joined with straight line segments.
Scatter charts often are used for small or medium data sets where a sorting criterion can be defined on the first independent variable. Line charts are often used in correlation to regression curves and trendlines.