Difference between g and G

What is the difference between capital ‘G’ and small ‘g’ in the chapter gravitation?  g  G  Acceleration due to gravity  Universal constant of gravitation  varies from place to place  A constant everywhere on earth  vector quantity  A dimensional constant  unit is ms-2  unit is Nm2kg-2 Incoming search terms:difference between G and Gdifference bet g and Gdifference [...]