Data visualization tools are used to represent data in graphical formats such as charts, graphs, and dashboards, making complex information easier to understand and analyze. Tableau is a popular business intelligence tool that allows users to create interactive and visually appealing dashboards using a simple drag-and-drop interface. Power BI, developed by Microsoft, is widely used for business reporting and integrates well with other Microsoft products, enabling users to analyze and share data efficiently. Matplotlib is a Python-based visualization library that provides high flexibility and control for creating detailed and customizable plots, commonly used in data science, research, and machine learning applications.