Answer:
Productivity refers to a measure of effectiveness of a person, machine, process, action, etc. The productivity can be found by comparing the average output and the total resources used (Money, time, material, energy, etc).
For example, a person that takes 1 hour fixing a car is way more productive than a person that fixes the same car in 10 hours.
Another example could be, a factory that produces 50 plastic glasses in 3 minutes is way more productive than a factory that produces the same amount of plastic in an hour.
As mentioned before, you can measure productivity not only against time, but also against all the material used, the energy, money etc.