Data visualization is about using visual representations of data to aid understanding. It can be used to find unknown insights, make an impact, and change the world. While powerful, data visualization can also go wrong if not done carefully. To get started, one should play with data visualization, find reasons to build visualizations, practice by recreating visualizations from examples, get feedback, and learn through books, blogs, and developing design process skills. With practice, data visualization can be a helpful tool.