Before we do footprinting, we have to understand what footprint is. Footprinting (also known as reconnaissance) refers to the process of collecting as much as information as possible about the target system to find ways to penetrate into the system. Information such as ip address, Whois records, DNS information, an operating system used, employee email id, Phone numbers etc is collected. These information is very useful to a hacker who is trying to crack a whole system.

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