Question

What is a reference point ?

Answer 1

reference point is a place which can be to used to identify a location

Answer 2

Reference point is any place or point or coordinate which you take as standard with respect to which you will standardize other phenomena relatively. Suppose you want to measure distance of a coffee shop and a cyber cafe from your house and you start measuring from your house. Then your house is the reference point. Similarly if you start measuring distance from cyber cafe to your house and to the coffee shop then cyber cafe becomes reference point.
I hope it will be helpful for you.