This entry covers scripting a basic Operator in Blender. An operator essentially is an operation which can be performed in/on your project. Some existing examples are Smooth Shading, or moving objects in the scene. The move operator is one of many ways of integrating custom functionality (or add-ons) into Blender.
For this example, I'll just show a conventional "Hello World" approach. Below is an example of all the basic code required for a custom operator.