An useful software would be WinRAR, that allows you to turn the files into rar/zip (packed) files along with extract (unpack) them and/or others.
You need to upload the file on a website and give them the link. What you could do is upload it on www.mediafire.com (http://www.mediafire.com) - It's free even if you sign up and such.
Then go on www.tinyurl.com (http://www.tinyurl.com) and make your own url by copying and pasting the link there and handing it out to your friends/writing it in your bio.
Another way of doing it is sending the file through email/skype or any other program, but in that case, it won't be public and only the ones you send it to - will be able to see it.