Question

What is the differance between gravitational constant & accelaration due to gravity?

Answer 1

 gravitational constant is the universal constant..it is denoted by G..it is numerically equal to the force experienced by one of the two unit masses placed at 1 metre apart..it is equal to 20/3*10^-11 Newton metre squared per kilogram squred. 
While on the other hand, acceleration due to gravity is just the acceleration produced in any mass by the gravitational force of earth...it changes from place to place as per the distance between the mass and the centre of mass of the earth..in general, its value on the surface of the earth is 9.8 metre pes second squared. 
Thanks.

Answer 2

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The universal gravitational constant is represented by G and acceleration due to gravity is represented by g.

G is constant or same everywhere in the universe but g varies for example g at earth is 6 times larger than g at moon.