Hot map color scheme

Quick answer：

A hot map, also known as a heat map, is a graphical representation of data where the intensities of various values are denoted by colors. A well-chosen color scheme is crucial for effective communication of the data. The color scheme should be distinguishable, consistent, and reflect the range and distribution of the data accurately. Common practices include using a gradient of colors, such as blue for low values and red for high values, or a diverging color scheme with a central color representing the median value. The choice of color scheme depends on the type of data and the context of the visualization.