Answer:
Open and click rates
Explanation:
Open and click rates are measuring units of how well your campaigns perform.
Answer and Explanation
A database is an organised collection of a data which is stored and can be easily, managed, updated and can be accessed electronically when required. The reason for importing your data into the data base is because this data is secure from unauthorized people. This is because to access this data you need to login. You can also update it and access it electronically when the need be.