To do something for a particular purpose; to perform a function.

कार्य करना

English Usage: She decided to act for the greater good.

Hindi Usage: उसने सामूहिक भलाई के लिए कार्य करने का निर्णय लिया।

A deed or action; something that is done.

कार्य

English Usage: The act of kindness was appreciated by everyone.

Hindi Usage: दयालुता का कार्य सभी द्वारा सराहा गया।