What is a key feature of full-duplex communication in web applications?

The key feature of full-duplex communication in web applications is that it facilitates simultaneous two-way data transmission. In full-duplex communication, both the client and the server can send and receive data at the same time, allowing for a more interactive and responsive user experience. This is especially important in real-time applications such as chat applications or live updates, where prompt data exchange is crucial for functionality and user satisfaction. This characteristic contrasts with half-duplex communication, where data transmission can occur in only one direction at a time, which would limit interaction and responsiveness in web applications.

Simultaneous two-way communication enables features like active updates without the need for constant polling or refreshes, thus contributing significantly to the performance and usability of modern web applications. The other options describe features or limitations that do not align with the definition or capabilities of full-duplex communication.