Vision is a human’s dominant sense. It is the communication channel with the highest bandwidth into the human brain. Security tools and applications need to make better use of information visualization to enhance human computer interactions and information exchange. In this talk we will explore a few basic principles of information visualization to see how they apply to cyber security. We will explore both visualization as a data presentation, as well as a data discovery tool. We will address questions like: What makes for effective visualizations? What are some core principles to follow when designing a dashboard? How do you go about visually exploring a terabyte of data? And what role do big data and data mining play in security visualization? The presentation is filled with visualizations of security data to help translate the theoretical concepts into tangible applications.