Data Visualization is the practice of translating complex data sets into visual graphics for easy understanding and analysis. Coursera's Data Visualization catalogue teaches you to use visual elements like charts, graphs, and maps to present data more effectively. You'll learn about the principles of good visual design, how to create interactive visualizations, and how to use software tools to manipulate and present data. You'll also understand how to use color, size, and position effectively for better understanding and decision-making. This will enable you to communicate data insights more effectively, whether you're a data analyst, data scientist, statistician, or any professional dealing with data.