What is Parameterization in qtp and Types of Parameterize ?

A parameter is a variable that is assigned a value from various data sources or generators.

Types of Parameter :

Test, Actions and component parameters enable you to use values passed from your test or component, or values from other actions in your test.

Environment variable parameters enable you to use variable values from other sources during the run session.
Random number parameters enable you to insert random numbers as values in your test or component.