Data visualization principles focus on effectively presenting data to enhance understanding and decision-making. Key principles include clarity, where visualizations should be easy to interpret and free from misleading elements; accuracy, ensuring the data is represented truthfully without distortion; and simplicity, avoiding unnecessary complexity that can obscure the message. Effective visualizations also prioritize context, providing enough background to make the data relevant, and consistency, using uniform formats and scales to aid comparison. Additionally, interactivity can enhance user engagement, allowing viewers to explore data dynamically. Adhering to these principles helps convey information clearly and meaningfully.