What are the port exactly and how can use it for a HACKER's point of view.

hey guys how are you? write it .it is really important for me....
In this post I am going to tell you about Port.What the port is?

well, there are basically two kind of ports -Physical (hardware) and Virtual (software).You may be know ports as a slots behind computer where we plug mouse ,keyboard. these are the physical ports but as you guys are hacker so i m sure you people are interested in virtual ports means software ports.
" A port is a virtual or physical pipe through which information flows.A particular computer can have a large no of ports.each port has it's uniqe port number and max of the port are used for services.

some popular ports and services running are:
ping 7
time 13
telnet 23
SMTP 25
whois 43
HTTP 80
Finger 79
SSH 22 (this is same as secure shell login)

For more information about port number just go to your favourite search engine
type RFC and read it
NOTE:
1:RFC stands for Request for comment.it cover each aspect of networking and internet.
2:for more info regarding port (not about port scanning because i will tell you port scanning in other post) can ask me 0n facebook www.facebook.com/ashutiwari4 or can simply type in comment box...