An open curve
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A line is a series of points that extends in two opposite directions without end.It has no thickness.
The shape that has 2 end points is known as a line segment. A line segment is a line that can go on forever, but it has a start point and an end point, no matter where it stops.
a line
A "line" does. A "line segment" does not. Most people interpret "line" to mean "line segment" (without realising it) and so would conclude that a line does not go on forever. A "line segment" is a line between two points, which is what you would draw if told to draw a "line" on a piece of paper.
An infinite series of points