The process of testing single fuctionality with multiple sets of data is said as paremeterisation.
A simple example can be login
To test login functionality, the list of data can be exhaustive. But for manual parameterization, some sets could be selected, such as few valid / invalid data etc
Eg: Valid data: Test login functionality of Gmail, with ur Gmail Id Invalid data: Test login functionality of Gmail, with ur Yahoo Id Test login functionality of Gmail, with some junk data like only numbers, special characters, unregistered Email IDs etc
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