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XML
Stands for "Extensible Markup Language." (Yes, technically it should be EML). XML is used to define documents with a standard format that can be read by any XML-compatible application. The language can be used with HTML pages, but XML itself is not a markup language. Instead, it is a "metalanguage" that can be used to create markup languages for specific applications. For example, it can describe items that may be accessed when a Web page loads. Basically, XML allows you to create a database of information without having an actual database. While it is commonly used in Web applications, many other programs can use XML documents as well.
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Y2K
Stands for "Year 2000." However, this term is more often used to refer to the "Millennium Bug." This bug is a little creature that lives inside older computers. When the year 2000 rolls around, the little bug will self-destruct, blowing up the computer it was residing in. The chain of explosions across the world will be catastrophic, causing global panamonia and LA riots. Also associated with Y2K is the end of the world, which is without doubt, foreshadowed by the dredged Millennium Bug. So, on January 1, 2000, you'll want to make sure you have at least a 5 year's supply of food and water, roughly half a million dollars in cash, and at least 200 acres of land somewhere in Montana. Of course, it doesn't really matter, considering the world will have ended anyway.

Update:
We're past the year 2000 and the world is still going! No Armageddon, no major computer explosions, no nuclear holocaust, even no L.A. Riots... Wow, I guess Y2K wasn't really that bad after all (surprise, surprise). Sorry about those of you who bought 200 acres of land in Montana. =)
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Zip
Windows users will see this term a lot when looking for files on the Internet. A zip file (.zip) is a "zipped" or compressed file. For example, when you download a file, if the filename looks like this: "filename.zip," you are downloading a zipped file. "Zipping" a file involves compressing one or more items into a smaller archive. A zipped file takes up less hard drive space and takes less time to transfer to another computer. This is why most Windows files that you find on the Internet are compressed.

To use a zipped file, you'll need to unzip it first. PKZIP for DOS, or WinZip for Windows, are some popular programs that can unzip files for you. Fortunately, these programs can be downloaded for free from Web sites like Download.com. Macintosh files are most often "stuffed" into Stuffit files (.sit), which can be "unstuffed" using Aladdin's Stuffit Expander.

The term "Zip" also refers to a product by Iomega. The company makes a removable storage device called a Zip Drive. Depending on the model, these drives can hold 100, 250 or 750 MB Zip disks. They are usually used for backup and for transferring large files to different locations. However, Zip drives are not as fast as hard drives, so it is usually not a good idea to run programs off them.

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