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Differentiate between variable and mapping parameter?

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Below is the differentiate between variable and mapping parameter

>> A Mapping variable is dynamic, i.e. it can vary anytime throughout the session. The variable’s initial value before the starting of the session is read by PowerCenter, which makes use of variable functions to change the value. And before the session ends, it saves the current value. However, the last value is held by the variable itself. Next time when the session runs, the value of the variable is the last saved value in the previous session.

>> A Mapping parameter is a static value, defined by you before the session starts and the value remains the same until the end of the session. Once the session runs, PowerCenter evaluates the parameter’s value and retains the same value during the entire session. Next time, when the session runs, it reads the value from the file.

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