Footprinting is a part of the Reconnaissance phase of Ethical Hacking in which you gather information about the system/ application. The main aim of Footprinting is to gather as much information as possible about the system/ application to narrow down the areas and techniques of attack.
For more information refer to https://www.edureka.co/blog/footprinting-ethical-hacking-kali-linux/ (Ans Source)
Hope this helps!
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