What is the difference between economic activities and non-economic activities

What is the difference between economic activities and non-economic activities? 

Answer: An activity which is done with the aim of monetary return is called an economic activity, while an activity which is not done with the aim of monetary return is called a non-economic activity. 

The most quoted example to understand this is that of a teacher. When a teacher teaches students in a school, he is doing economic activity. When the same teacher teaches his son, he is doing non- economic activity.