Charting libraries are software tools that help developers create visual representations of data, such as graphs and charts. These libraries provide pre-built functions and components, making it easier to display complex information in a user-friendly format. Popular examples include Chart.js, D3.js, and Google Charts. These libraries support various chart types, including line, bar, pie, and scatter plots. They often come with customization options, allowing users to adjust colors, labels, and styles to fit their needs. By using charting libraries, developers can enhance data analysis and improve user experience in applications and websites.