A heatmap is a data visualization tool that uses color to represent the intensity of data values across a specific area. It allows users to quickly identify patterns, trends, and anomalies in large datasets. Heatmaps are commonly used in various fields, including marketing, healthcare, and web analytics, to analyze user behavior or performance metrics. In a heatmap, different colors indicate varying levels of activity or concentration. For example, warmer colors like red may represent high values, while cooler colors like blue indicate lower values. This visual representation makes it easier for analysts to interpret complex data at a glance and make informed decisions.