The legend, or key.
legend
legend>
It is the key or legend.
legend
The legend or key.
It is called the key or legend.
It is the legend or key.
The difference lies in the usage of the words. For example a graph is used in math, and charts are simply a way to represent different types of data.
Charts and graph is an amazing visual tool to explain a concept to an audience. Since many people are more visual, seeing a graph or chart that represents the information can help people visualize the concept.
legend>
legend>
The Cartesian graph is divided into four sections called quadrants.