TCP communication guarantees packet delivery and is suited for applications that require high reliability.
TCP is used by:

• HTTP
• HTTPs
• FTP
• SMTP
• Telnet

TCP rearranges all of the packates in a specific order (sequence).
TCP header size = 20bytes
TCP requires 3 packets to set up a socket connection before any user data can be sent.
Error checking

TCP handshake involves the following:

Client        Server
SYN --------> 
    <------- SYN-ACK
ACK --------->