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As you can visualize the example above. The line segment PQ connects the points P and Q. The points P and Q are called the 'endpoints'( or end point for singular)of the segment. The word 'segment' typically means 'a piece' of something, and here it means the piece of a full line , which are known to be going on forever. A line segment is one dimensional and in geometry is known to have zero width.
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