Hehe....thts all related to hacking....
Ethical hacking is like hacking ur self....the owner of it bypasses there own website or databases and analyze its weak points or vulnerability

its like the first step of tests the vulnerability or weak points of a website

exploit.....or better to use exploit programmes are used to hack using the weak points of a LOIC ...loic has http, uhd and sql injections....or htey send many packets and that website gets overload and shuts down

finally vulnerebility.......u might already have an idea of it.....its like how likely the website is to be hacked........or how weak it is

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I know that all this words are from hacking terminology I just wanted exacaly they are because iam a script kid ee.!!