Client-Side Rendering (CSR) is a web development technique where the browser downloads a minimal HTML page and then uses JavaScript to dynamically generate and display content. This means that most of the processing happens on the user's device, allowing for a more interactive experience as users can see updates without needing to reload the entire page. In CSR, frameworks like React, Vue.js, or Angular are often used to build applications. These frameworks help manage the user interface and state, making it easier to create responsive and engaging web applications. However, CSR can lead to longer initial load times since the browser must download and execute JavaScript before displaying content.