What is the difference between ‘G’ and ‘g’?

Gravitational constant (G) |
Acceleration due to gravity (g) |
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* It is defined as the force of attraction between two objects of unit mass each separated by unit distance. | * It is defined as the acceleration of an object freely falling under the action of force of gravity. |

* Universal constant and its value is 6.673×10^{-11}Nm^{2}kg^{-2}. |
* Constant at a given place and its value changes from place to place. Mean value of g on surface of earth is 9.8 ms^{-2}. |