Socket 1366
Socket 1156
Socket 1155
Socket LGA 2011
are in use presently
LGA1366, LGA771, and LGA775
I'm not sure about the third one, but I know two of them: LGA1155 LGA2011
775 - but almost phased out 1156 - for coewi3 nad core i5 1366 - for flagship i7 there are others for the xeon server chips (i think) but that's business and enterprise not consumer
The sockets are different, so by default, you cannot use them in a desktop. There are adapters for Pentium M and Celeron M chips to be used in Socket 478 motherboards. You can purchase motherboards specifically made to support mobile processors as well.
LGA775, LGA1155, and LGA1366 are the most common Intel sockets. However there are several more still being used, and some that Intel has just recently released; such as LGA1156, LGA2011, LGA1248, and LGA1567.
No. Xeon processors use different chipsets and sockets, thus they are not interchangeable with mainstream processors.
Only I7 CPU family, no other processors.
No, the processor that you put on the motherboard has to have the same socket as the motherboard. The socket number will be right on the the part that the processor snaps onto. You also have to check the motherboard manual to see if it is compatible with the new processor speed ( example: 1.3ghz)
LIF sockets stand for low insertion force. LIF sockets are sockets commonly used for early generation computer processors. LIF is used to provide an "interference fit" between two components (a plug and a socket) so that a small amount of force is required to engage them and fully use.
The architecture used in most CPU sockets and processors today is known as PGA architecture. This is referred to as pin grid array.
This is accomplished by several means, including two processing units installed on the same die (used by Pentium processors), a motherboard using two processor sockets (supported by Xeon processors), and two processors installed in the same processor housing (called dual-core processing).
Not unless you replace the entire motherboard. Intel and AMD processors use different sockets and different chipsets.