Why do we need zip files?

Using zip files gives us a lot of advantages on many occasions.

Instead send an email with multiple attachment files, send a single compressed file within your email as an attachment will help you reduce email size and transmission time.
Compress your infrequently large data files into an archive and save your storage space.
Distribute some files as a compressed file can save your server’s bandwidth usage and help the persons who download the file to get a smaller size and a faster download.