In addition, provided you install the client software, you will have a folder on your hard drive that mirrors its contents, meaning you can send somebody a file simply by copying it into the Dropbox folder on your computer, then sharing its public link.
Dropbox is a free service that lets you bring your photos, docs, and videos anywhere and share them easily. Never email yourself a file again!
its cloud storage for your documents and files, so you can access them on any pc or phone, if you know the password.