Linear interpolation simply means finding a value in between two given values, 'Lerp' is the function used for this. It will linearly interpolates
between the two given values.

Lerp can be used for following different types:-

1. Vector3 Lerp:- This will interpolate between the two given vectors.
                   Vector3.Lerp(Vector3 X,Vector3 Y,float Q)
                   Here it will interpolate between X and Y by interpolant Q.
                   It is mostly used in cases where you have to move an object between two given points.

2. Mathf Lerp(float):- Here it will linearly interpolates between two values

Example:-

P=20;
Q=30;
Value=Mathf.Lerp(P, Q , 0.5);
// value==25

3. Color Lerp:- It will interpolate between two colors by some value
                 Color Lerp(Color D, Color E, float F)
                  Interpolates between D and E by F