Blender drivers are a way to control values of properties by means of a function, or a mathematical expression. Use this tag for questions about Blender drivers.
The Blender manual describes drivers thusly:
Drivers are a way to control values of properties by means of a function, or a mathematical expression.
Effectively, drivers consist of:
A driver configuration that specifies zero, one, or more input values using other properties or object transformation channels, and combines them using a predefined mathematical function or a custom Python expression.
An animation F-Curve that maps the output of the driver configuration to the final value to apply to the driven property.
