Sync, and, share files online for free- Dropbox (drop box)

Sync, and, share files online for free- Dropbox (drop box)
No complicated interface to learn. Dropbox works seamlessly with any operating system and offers the features listed below:

File Sync- sync your files online and across your computers automatically.
2GB of online storage for free - up to 100GB available to paying customers.
Sync files of any size or type
Sync Windows, Mac and Linux computers
Automatically syncs when new files or changes are detected.
Work on files in your Dropbox even if you're offline. Your changes sync once your computer has an Internet connection again.
Dropbox transfers will correctly resume where they left off if the connection drops.

Efficient sync - only the pieces of a file that changed (not the whole file) are synced. This saves you time.
Doesn't hog your Internet connection. You can manually set bandwidth limits.

File Sharing- Sharing files is simple and can be done with just a few clicks.
Allow several people to collaborate on a set of files.
See changes made by other instantly.
Creating a "Public" folder allows you to link directly to files in your Dropbox.
Control who is able to access shared folders (including ability to kick people out and remove the shared files from their computers).

Automatically create shareable online photo galleries from folders of photos in your Dropbox.

Online Backup- back up files online.
Automatic backup of your files.
Undelete files and folders.
Restore previous versions of your files.
30 days of undo history, with unlimited undo available as a paid option.

Web Access- A copy of your files are stored on Dropbox's secure servers. This lets you access them from any computer or mobile device.
Manipulate files as you would on your desktop - add, edit, delete, rename etc.
Search your entire Dropbox for files.
A "Recent Events" feed that shows you a summary of activity in your Dropbox.
Create shared folders and invite people to them.
Recover previous versions of any file or undelete deleted files.
View photo galleries created automatically from photos in your Dropbox.

Security & Privacy- Shared folders are viewable only by people you invite.
All transmission of file data and metadata occurs over an encrypted channel (SSL).
All files stored on Dropbox servers are encrypted (AES-256) and are inaccessible without your account password.
Online access to your files requires your username and password.
Public files are only viewable by people who have a link to the file(s). Public folders are not browsable or searchable.

Mobile Device Access- The free Dropbox iPhone app lets you:
Access your Dropbox on the go.
View your files on your iPhone or iPod Touch.
Download files for offline viewing.
Take photos and videos and sync them to your Dropbox.
Share links to files in your Dropbox.
View interactive photo galleries.
Sync downloaded files so they're up-to-date.

Home page- www.dropbox.com