Most documents can be compressed using special computer algorithims so that
they use less space on a hard drive. This makes them faster to
download over slow links such as a modem. The most common compression
format is zip. Zip compressors and decompressors can be downloaded
for free. Even if you don't know what they are you still may
have one installed already on your computer! Try downloading one of
the compressed archives and double click on it to seem if your computer already
knows what to do with them. If you are sure you don't have one here
are two places you can download them from: