A Heat Map is a graphical representation of data that uses color to represent different values. It is used to visualize the relationships between different variables and to identify areas of high and low concentration. The map is typically used to identify areas of potential interest, such as areas of high or low concentration of
From Wikipedia
A heat map is a two-dimensional data visualization technique that represents the magnitude of individual values within a dataset as a color. The variation in color may be by hue or intensity.