http://www.howstuffworks.com/file-compression.htm/printable
Compression (such as compressing it into a .zip or .rar file), but the file will have to be uncompressed again before it can be used.
A .zip file may be used when compressing multiple files in one.
No, compressing is making the file smaller by size and extracting is taking out the files to be ran. Basically, you compress a file to keep space and de-compress/extract it back. Decompressing=Extracting
No, you cannot directly convert a 7-gigabyte (GB) file into a 4-gigabyte (GB) file without compressing or reducing the file's size.
No. 7-Zip uses lossless compression. The file that comes out when decompressed is a byte-exact replica of the one that was put in.
This all depends on your personal preferences. Compressing files will make them easier to transfer and transport. However, compressing files will also affect the quality. If it is an image or video, compressing it will greatly affect the quality.
1.creating of file .2.updating .3.referencing .4.emerging .5.maintenance .6.file search .7.file sorting .8.file interrogation .9. File compressing .10.create duplicate of data
Depending on your OS, it would probably be a .zip file, but it could be something else. If all else fails, try compressing a file and see what its extension is.
Compressing images and sound, optimising vector images and recycling images from libraries.
Two advantages of compressing files and folders is that firstly you can free up space on your hard drive. Secondly, when you want to send the folder or file as an e-mail attachment, there will be no attachment size or delay issues.
A Unix script is not necessary. The zip utility has the capability of compressing the files with a password.