What do you mean by multiple cropping

What do you mean by multiple cropping? 

Answer: Growing more than one crop on a piece of land during the year is known as multiple cropping.

It is the most common and traditional practice to increase production on a given piece of land. All farmers in Palampur grow at least two main crops,

Jowar & Bajra and Wheat. 

Many others have grown potato as the third crop for the past twenty years.