What is the difference between IP address and Mac address?
IP address: To every device IP address is assigned, so that device can be located on the network. In other words IP address is like your postal address, where anyone who knows your postal address can send you a letter.
MAC (Machine Access Control) address: A MAC address is a unique serial number assigned to every network interface on every device. Mac address is like your physical mail box, only your postal carrier (network router) can identify it and you can change it by getting a new mailbox (network card) at any time and slapping your name (IP address) on it.