- Just like [[UDP]], operates at the **Transport Layer (Layer 4)** of the [[OSI Model|OSI model]] and provides end-to-end communication between applications. - 3 Way Handshake. - Used for more reliable transmission of data where order and confirmation of data delivery is important. - Reliable but slower than UDP. - Examples: - Web browsing, emails, or file transfers. - Important because it establishes a connection, guarantees delivery, and keeps packets in order.