Answer:
Ball and stick models give us a view of the three dimensional arrangement of atoms in a molecule. It provides sufficient information regarding the relative positions of the atoms, types of bonds, bond angles and distances. Since we cannot physically see a molecule, this way it is the closest we can get to visualise how a molecule looks like.
The balls represent atoms, their colour code and size represent specific elements, while the sticks give us idea about the length, type and directional disposition of bonds. The models also help us to understand all the nuances of stereochemistry including variations in conformational structures.
Step-by-step explanation: