There are a variety of programs available to compress large files. Winzip, Winrar, Zipgenius, Stuffit, Winace, etc. I prefer zipgenius. It's completely free and offers all of the nice features that the other's provide.
http://www.zipgenius.com
Now, consider that this won't reduce very much on files like mp3, avi, or jpg because they are already compressed versions of an original. If you are looking to reduce the file size for emailing purposes, you'll have better luck using a third party large file transfer website. I'd recommend toobigforemail, they'll let you send up to 2gb with a free account.
http://www.toobigforemail.com
Those programs that compresses larger files to smaller files are called ripping softwares. Some examples of these softwares are Winrar, 7-Zip, Uharc, kgb archiever,etc.
its in the question dummy. compression
Right-click > Send to > Compressed Folder 7-zip or WinRAR are programs to manipulate "archived" or "compressed" files.
winzip
NTBackup.
A ZIP file is a format that compresses files to be smaller. A computer can do this, by making the code of the files in the folder a bit smaller. If you want more information on ZIP files use the link provided below.http://en.wikipedia.org/wiki/ZIP_(file_format)#The_structure_of_a_ZIP_file
That would be an encryption. Encryptions are usually found within safe looking files and programmed macros.
No, usually MP3 files are much smaller than wave files, because they use compression to reduce the size.
Codec bruhh
The primary advantage is that it makes your files smaller. Smaller files do not take up as much room on your storage device as larger files. The primary disadvantage is that you might loose sound quality or fidelity.
It is a File Compression utility. It compresses really big files into smaller packages so that they can be transferred or downloaded quickly. Once the files have been transferred/downloaded, they must be uncompressed (expanded) before they can be used.
Disk defrag AKA Disk Defragmenter is a way to reduce clutter and to "defragment" files. This essentially makes your computer faster in the sense that it can load files faster. This program also compresses files and clears up small amounts of hard drive space.