Database activity monitoring (DAM) systems monitor and record activity in a database and then generate alerts for anything unusual.
A feedback loop is a system where some portion or all of the output produced by the system returns as input, effecting the succeeding processes of that system in some way.
Keyword stuffing is the practice of inserting a large number of keywords into Web page content and meta tags in the attempt to artificially increase the page's ranking in search results.
Proxy hacking, also known as proxy hijacking, is an attack technique designed to supplant an authentic Web page in a search engine's index and search results pages. An attacker may use proxy hacking to gain an advantage over a competitor or, ultimately, to redirect users requesting the targeted page to a malicious or fraudulent website.