An Ethernet crossover cable is a type of Ethernet cabling it is use to connect computing devices together directly without a switch or router. You can connect two computers with this cable. Normally its use in home networks.
What is the deference between patch cable and crossover cable?
As it is names it is simply twisting two pairs each other. In a network port one and two pins are for transmit, three and six pins are for receive. Cables 1 and 2 wires connect to pin 3 and 6. See the image for more details