Hacker - A person who tries to illegally access or attack a computer network or device
Passive attack - Where a hacker monitors data travelling on a network
Insider attack - A network attack where someone within an organisation exploits their network access to steal information
Backdoor - A vulnerability in a computer or networks security, a hacker could exploit
Password - A string of characters that allow access to certain parts of a computer program
Brute force attack - A network attack which uses software to crack security passwords through trial and error