Server farm: a large collection of computers, such as those used by Google to store information. No single computer could store all the data needed by Google, so it uses many, many computers in numerous locations.
cache: [from wikipedia.org] In computer science, a cache is a component that improves performance by transparently storing data such that future requests for that data can be served faster.
cookie: a small piece of text (programming code)stored on a user's computer by a web browser. The cookie contains information about your visit to and activity on a Web site, such as shopping history or preferences on Amazon, or entering your name or address into an online form. You can use the tools setting in your Web browser (the software used to view Web sites) to purge the cookies from your computer, if you like.
Source code - the underlying programming language that makes a Web site look and function as it does. No need to ever view this code unless you're a programmer.
Trojan Horse - a piece of software or code that appears harmless but is actually harmful to your computer.
A Web search works in three steps:
crawler: Searches the Web for new Web sites
Index: database of web sites (web pages)
Query processor: uses your query to find relevant pages in the index
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