--DDoS - Distributed Denial of Service - DDoS is a type of attack mostly used on websites or different kind servers. How this works - Using different kind of tools (Botnet, RAT...) the user or the bots are sending big amount of requests to the targeted website. Depending on the number of requests and users involved, the attack is stronger.

--Database - Mostly used as website database - is a directory that contains all the files and sub-directories that are used in building the website, updating it and basically everything that the website is build from. The word database is used in few other ways.

--Hacking - With simpler words, gaining access, admin permissions etc. - is the dark side of the internet. The word hacking basically means gaining access without approval (or permissions) from the owner - admin. By the word hacking there are many directions, techniques, methods.

--Vulnerability - mostly used as website vulnerabilities - is a flaw in a website security. There are different types of website vulnerabilities.Few of them are - XSS,SQL injection, LFI, different kind of exploits and many more. These vulnerabilities are mostly used by hackers to deface the page, steal the database(that includes usernames,password and everything that is on the site), inject a code into the page (cookie stealers etc.)

--Deface - mostly used as a website deface - is the process when the hacker replaces the existing index of the site that is being hacked with his deface page. This is mostly done when the hacker exploits a vulnerability and gains the permission to change/edit the index.

--Phisher/Phishing Site - mostly used as fake website generator that sends the text entered in the text boxes to a third party person - is a fake website that is made to trick the user into entering confidential informations such as username,password and then sent to third party person, the creator of the website.

--Stealer - hacking program - is a program that is used to make executable server that will steal the victim username, passwords, IP etc. when double-pressed. The stolen credentials are stored in form of logs that are stored in the hosting used while creating the server.

--RAT - hacking program - is a program that is used to make executable server that will establish a connection between the hacker and the victim. After the connection is established, the hacker gains admin permissions of the victim's computer. Using a RAT software you can do many different operations with your victims.