This tutorial introduces the concept of gravitational acceleration. This tutorial explains the notation, numerical value, and how the numerical value of the gravitational acceleration is obtained. This tutorial includes two widgets: one where one can see the strength of the acceleration of gravity from any location on Earth, and another one where one can see a comparison of the acceleration of gravity of planets in our solar system to everyday objects, and to other objects in the solar system. The tutorial also includes a pictorial example, along with the widgets, along with links to tutorials to other general Physics concepts, simulations, and student activities. This is part of The Physics Classroom. This web site also includes interactive tools to help students with concepts and problem solving, worksheets for student assignments, and recommendations for simple introductory laboratories.