http://www.howstuffworks.com/file-compression.htm/printable
reducing
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.
If you are wanting to change the file format then changing the file extension should work, I've done it many-a-time. Some formats might not work because of complicated compressing/encoding etc. but most common ones do! Hope that helped :)
The JPG file format works by compressing images to reduce file size while maintaining image quality. It achieves this by discarding some image data that the human eye is less likely to notice, resulting in smaller file sizes without significant loss of visual quality.
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. 7-Zip uses lossless compression. The file that comes out when decompressed is a byte-exact replica of the one that was put in.
No, you cannot directly convert a 7-gigabyte (GB) file into a 4-gigabyte (GB) file without compressing or reducing the file's size.
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.