What is Kali Linux?

Kali is an Operating System that has a bunch of preinstalled ethical hacking tools, it's also used a lot with pentesting

What is Kali used for?

Exploitation Tools
Forensic Tools
Cyptography
Hardware Hacking
Information Gathering
Password Cracking
Reverse Engineering
Wireless Attacks
Web Applications
Stress Testing
Sniffing and Spoofing
Vulnerability Analysis
& much much more!

Why do we use Kali?

A lot of the tools we use in CTF's & in CSEC positions are already in Kali Linux.

this makes it easy to install on a computer especially if someone has a usb with a .ova kali file

When dealing with malicious software such as writing it or downloading it, running that in a VM protects your computer from any worst case scenario.