* **Encryption in the Transport Layer:** The core of the change is shifting encryption from the application layer to the transport layer. This is a significant shift in how data is protected. Traditionally, encryption was handled at the application layer, where it was often used to protect sensitive data within individual applications.

However, the problem is that TCP is designed to be reliable. It’s built to ensure that all data arrives at the destination in the correct order and without errors. This reliability comes at a cost: it can be slow and inefficient. Here’s the breakdown:

1. **TCP’s Reliability:** TCP’s core principle is to ensure data arrives in order and without errors. This is achieved through a combination of acknowledgments, retransmissions, and error detection mechanisms. * **Example:** Imagine sending a package through the mail.

TCP and QUIC are two different protocols used for communication over the internet. TCP is a connection-oriented protocol, while QUIC is a connection-oriented protocol. Both protocols are used for web browsing, but they differ in their approach to establishing and maintaining connections.