Final answer:
A segment bisector is a line, segment, or ray that divides a segment into two congruent parts. It cuts a line segment into two equal halves and helps define and locate the midpoint of a line segment.
Step-by-step explanation:
A segment bisector is a line, segment, or ray that divides a segment into two congruent parts. In other words, it cuts a line segment into two equal halves. The segment bisector is also known as the midpoint of the segment because it divides the segment into two equal lengths.
For example, in the segment AB, if the segment bisector is C, then AC is equal to CB.
Segment bisectors are important in geometry because they help define and locate the midpoint of a line segment.