Ethical hacking also known as penetration testing refers to the act of intruding or penetrating multiple IT systems and networks to explore hidden vulnerabilities and other possible points of the breach. The ones that can be used and exploited by an illicit hacker to gain access to these sensitive systems. After gaining access these hackers can use the information causing loss of important data, financial losses associated with the data, and other major damages from where the chances of rebounding to control the ramifications start to shrink.
A cheat sheet is a comprehensive collection of the terms and concepts listed to trigger the memory mainly before an exam. Memorization is a difficult task when you have to cover loads of various concepts, and cheat sheets are used as handbooks to refer to when refreshing your memory regarding those concepts.
Hackathon is a kind of competition or an event in which the participants have to build any software or hardware of their choice in 24 hours. The participants may be teams or individuals from all over the world who are efficient enough to take part in this event. These Hackathons consist of a specific theme that may lie between solving a particular problem of delivery to improving the whole community altogether