Plotly is an open-source Python library designed for creating interactive visualizations that enhance data analysis and presentation. It supports a wide array of chart types, including scatter plots, bar charts, line plots, and heatmaps, making it versatile for various data visualization needs. One of its key features is the ability to generate interactive plots that respond to user interactions, which can be particularly useful in web applications and dashboards. With both high-level and low-level APIs, Plotly allows users to create complex visualizations with ease, making it a popular choice among data scientists and analysts alike.