Apache Traffic Server is an open-source web server and caching proxy designed to improve the performance of web applications. It acts as an intermediary between clients and servers, efficiently managing requests and responses. By caching frequently accessed content, it reduces the load on backend servers and speeds up content delivery to users. This software is highly scalable and can handle a large number of simultaneous connections, making it suitable for high-traffic websites. Additionally, Apache Traffic Server supports various protocols and features, including load balancing and SSL termination, enhancing its versatility in different network environments.