When two or more points connected each other in every direction, then it constructs a line. i.e. A line is a collection of points.
line extends infinitely in two directions. The points in a same line are called collinear points. A line has length, but no breadth or thickness.
Note: A line may be straight or curve but when we say ‘a line’ it means a straight line only. Each line, whatever is its length, has an infinite number of points in it.
A line is generally defined by two given points and is written as an arrowhead.
If a part of the line is defined by two endpoints, then that part of the line known as a line segment.
Intersecting lines and point
If two lines intersect in a point (O) then that lines are called intersecting lines and the point O known as intersecting points.