A heat map is a visual representation of data that uses colors to show the intensity of values in a specific area. For example, in a website analysis, a heat map can illustrate where users click the most, with warmer colors like red indicating high activity and cooler colors like blue showing less engagement. This helps businesses understand user behavior and improve their online experience. Heat maps are also used in various fields, such as geography and healthcare. In geography, they can display population density, while in healthcare, they might show the spread of a disease. By using heat maps, complex data becomes easier to interpret and analyze.