Answer :
By port number, port, or port address a client application identifies a server application on another computer on the network.
TCP/IP accommodates interaction to-handle correspondence, and that implies that calls need an addressing plan that determines both the physical host connection (Host An and Host B in Figure 1) and the product cycle or application (C, D, E, F, G, and H). The way this is finished in TCP/IP is for calls to determine the host by an internet address and the cycle by a port number. You might find internet addresses likewise alluded to somewhere else as internet convention (IP) addresses or host IDs.
IP addresses
Every server or client on a TCP/IP internet is distinguished by a numeric IP (Internet Convention) address. The two sorts of IP address are the IPv4 (IP version 4) address and the IPv6 (IP version 6) address.
Port numbers (for servers)
An approaching connection demand indicates its desired server by determining the server's port number.
Port numbers (for clients)
Client applications should likewise recognize themselves with port numbers so server applications can recognize different connection demands.
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