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Line
A line is the path of one point moving. A line has length but no width. A line is a type of geometric figure.
A line is made up of an endless number of points.
Line segments
A line segment is part of a line. Here is an example of a straight line segment:
Straight and curved lines
A line can be straight or curved. The word line usually means a straight line. A straight line is the shortest distance between two points. A straight line is the line traced by a point moving in a direction that does not change.
A curved line is sometimes called a curve.
For example, the edge of a circle is not straight. The edge of a circle bends in a curve.
Naming lines
Lines can get their names from any two points on the line. For example, if a line has a point named "A" on the line and a point named "B" on the line, then the line can be called either "AB" or "BA".
Sometimes, lines are also named with just one letter; for example, line A.
Two lines
Two lines can be:
 Parallel: Two lines are parallel if they are on the same plane and they never touch.
 Concurrent: Two lines are concurrent if they touch on one point.
 Coincident: Two lines are coincident if they are made of the same points.
 Perpendicular: Two lines are perpendicular if they make four right angles where they touch.
 Skew: Two lines are skew if they are not parallel but they never touch.
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