When you want to visualize data with Chart.js, you typically provide the data through JavaScript arrays and objects. Chart.js is designed to be flexible and works directly with your JavaScript variables, so you can easily update or generate data dynamically before passing it to your chart configuration. This approach makes it possible to visualize information that is calculated on the fly, gathered from user input, or fetched from external sources such as APIs.

To use dynamic data, you define your data as arrays or objects in JavaScript, then reference those variables within the data property of your chart configuration. Labels for your chart are usually supplied as an array, while each dataset is also represented as an object containing its own data array. Chart.js will read these structures and render the corresponding chart automatically.