File compression is a method in which large files are compressed using compression algorithm into smaller-sized files which is supported by a specific compression software. This is a very useful method if you want to email several files or folders which are large in size. You just need to compress files in a particular folder and send it via email. To access those files, the recipient of the file will need to have the same software with which the files have been compressed.
Most popular archive and compression utilities are WinZip (using .zip file extension), WinRAR (rar file extension), 7-zip (7z file extension), Windows Cabinet (.cab file extension [Microsoft]) and many others.