The purpose of every research is to explore a particular area and investigate some aspects of a researchable problem. While working on research work, you can realise that it needs to have a proper approach to meet the desired results. In this way, the research variables play a vital role. It is very important to understand the need and role of variables and their types as well. Every variable analysis and interprets something unique by relating different things. One of the most commonly used research variables is the control variable which can be observed in all studies. As per its importance, this article aims to discuss control variables and their importance.