What is bond angle? Explain.

(N/A) Bond angle is defined as the angle between the orbitals containing bonding electron pairs around the central atom in a molecule or complex ion.
Bond angle is expressed in degrees $(^{\circ})$ and can be determined experimentally by spectroscopic methods.
Uses: It provides information regarding the spatial distribution of orbitals around the central atom in a molecule or complex ion,which helps in determining its molecular geometry or shape.
For example,the $H-O-H$ bond angle in a water $(H_2O)$ molecule is $104.5^{\circ}$,as shown below:
$H-O-H$ bond angle = $104.5^{\circ}$