i think i have enough Info now

Great site explaining about both serial ports and parallel ports:
http://www.waterwheel.com/Guides/motherboards/motherboard_ports_io.htm,

Nice information i will surely use. It has information on the purpose of a USB, Parallel and serial ports:
http://en.wikibooks.org/wiki/The_Computer_Revolution/Hardware/Ports#USB_Ports

*currently Summarizing all information collected and doing wikispace*

**EDIT number 1=**
great site explaining ports and various other things: but has a long address xD,,

http://72.14.253.104/search?q=cache:2QpZ4GyzJMUJ:cs.utsa.edu/~akarmake/cs1033/Lectures/Ch4.ppt+%22what+are+ports%22+motherboard&hl=en&ct=clnk&cd=1&gl=au

This site answers the question "what are ports and sockets"

http://wiki.answers.com/Q/What_is_socket_and_what_are_ports