smtp
FTP uses TCP.Usage of Transport Layer protocol (tcp or udp) depends upon various applications.Such as FTP uses TCP, TFTP uses UDP.
TCP is a sub-protocol within the IP protocol. Think of TCP as one of the instruments in a band.
No TCP a reliable protocol whereas UDP is unreliable.
Tcp/ip
Server Message Block (SMB)( Explanation ) When NetBIOS is disabled, SMB runs over TCP/445. Kerberos runs on TCP/User Datagram Protocol (UDP)/88. RPC runs on TCP/135. HTTPS runs on TCP/443.
TCP is the protocol of network layer, It is connection oriented protocol. UDP is the protocol of network layer, It is connection less protocol.
SMNT
TCP
Tcp/ip
HTTPS ( Hypertext Transfer Protocol over SSL/TLS)
TCP-IP is a protocol, not a transmission medium. Bandwidth doesn't affect it.
TCP/IP is the standard default.