Socket

Sock Application (e.g., Netscape) - OSI layer 7 Application
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SOCK DLL/library - socket() - binding to a port to make it listen
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TCP/UDP - OSI layer 4 Transport
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IP/IPX
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Modem or Network card
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Network

Above is also called TCP/IP stack (stack is LIFO - last in first out)

TCP/IP stack is loaded into a memory space.

KERNEL = TCP/IP + NLB driver + network adapter driver

In unix :
driver/module in .so = shared object or .ko = kernel object (related with memory segmentation)
insmod, lsmod, rmmod