Which undefined geometric term is described as an infinite set of points that has length but not width?

The geometric term described as an infinite set of points that has length but not width is called a line. It has a negligible with and depth. In geometry, a line located in the plane is defined as the set of points whose coordinates satisfy a given linear equation. A line segment however is a line connected by two dots far apart from each other and then connected. For example is the equation y=mx+b. This is a slope intercept form which is a linear equation.

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