Understanding Compression and Decompression- Downloading files from the Internet has become one of the most popular activities on the Internet, and to send email and web browsing. We download files from software libraries, ftp directories, YouTube and Google Video, MP3 sites, and we download files sent to us as email attachments.
Being so popular an activity, file compression incorporates a number of different files into a single file, and can also significantly reduce the very large file to a smaller one. As a result, transmission of compressed files on the Internet faster and smoother. This article looks at the files are compressed a little closer and explain how to compress and decompress them using two of the most popular archiving programs.
Identifying Compressed Files
Most files are compressed in .zip format (if you are using Windows) or .sit format (if you're using a Mac). two programs were the most popular software used to compress and decompress files WinZip and StuffIt respectively. There are other programs that do the same thing and no program can even compress and decompress files for both Windows and Mac systems. But since Winzip and StuffIt most popular, we'll assume you'll use one to compress and decompress files yourself.
If you download the compressed file from a website or library files ending in .exe, note that even though the file is compressed, it is usually a file that will install a program onto the computer. Or .Sit .zip file did not install the software - they just archive their collections into one, or they significantly reduce the size of the larger ones.
decompression Files
Assuming that you have Winzip or StuffIt installed on your computer, you can access the archived files in the .zip or .sit file simply by double-clicking archives (files ending in .zip or .sit extension). Double-click one of the files will open a window that displays the contents of the archive. In most cases, you can double click the file in this window to use it, or you can select and drag the file to the folder to look at later.
Depending on how you choose to install Winzip or StuffIt, you may click the .sit kanan-.zip or file and have the program extract the contents to a new folder for you.
compressing Files
If you want to upload files or email files to a collection of friends, it is best to archive as a .zip or .sit file first. This will reduce the time it takes for your computer to send elsewhere, and would also reduce the time it takes for others to download it.
To create your own .zip or .sit file, you can select a single file or group of files from within Explorer, and right-click the selection. Again, depending on how you install Winzip or StuffIt, you can click the "Add to Zip" or "Add to Contact" option and have these programs automatically archive file (s) into one.
Some files compress better than others and in some cases, you may not realize that much of a difference. Best compress files that are images, documents, and multimedia files. Executable files (files that end with .exe) do not compress well, but when they were archived by a sufficiently large number of other files, they compress fairly well.
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