its a line but it can also be a line segment
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Two lines intersect at a point
A point where two lines meet is called an intersection. Also, more than two lines can be intersected in one point.
If two lines cross they share a point of intersection. For two straight lines this is limited to one common point, for two circles two points and for complex lines like two sine waves the number of common points has no limit.
A point.
If two different lines intersect, they will always intersect at one point.