### Theory:

Point
A specific position or location on the surface of the plane is referred to as a point. It has no length, breadth or thickness.

The above figure shows point $$A$$ and $$B$$.

A point is an invisible dot that may determine a location/position but can't be extended. To represent the location/position, we label each point using an English alphabet.
Example:
We plan to locate the five-place (let them be $$A$$, $$B$$, $$C$$, $$D$$ and $$E$$) on a map using the concept of points and label them accordingly.

Line segment
A line segment is the shortest distance between two points. It is also a part of the line. Name the line segment using its two endpoints.

The above figure shows a line segment $$PQ$$ and is represented as $$\overline{PQ}$$.
Example:
We plan to use the idea of a line segment to illustrate the distance between the places (let's call them $$A$$, $$B$$, $$C$$ and $$D$$) on a map and label them accordingly.

When we connect points $$A$$ and $$B$$, we get the line segment $$\overline {AB}$$.

Also, if we connect the points $$C$$ and $$D$$, we get the line segment $$\overline {CD}$$.

We can calculate the distance of $$\overline {AB}$$ and $$\overline {CD}$$ using measurements.