Google Drive

Google Drive offers a free 5GB online storage. You can upload and access all of your files, including videos, photos, Google Docs, PDFs and beyond. Here is the URL

Google Drive

You can install Drive on your Mac or PC , and use the service via an app on your Android phone or tablet. Google also has plans for an iOS app in the future. Blind users can access Drive with a screen reader.
Google is offering all users 5GB of storage on the service for free. If you need more than the 5GB, then it is offering several tiers of storage options

Once you’ve shared content with someone else, you can add and reply to comments on anything (PDF, image, video file, etc.) and you’ll receive notifications when other people comment the items you’ve shared.

Here is a quick look at the pricing of similar products per month:

Service	Free storage	Cost for 25GB	Cost for 50GB
Apple iCloud	5GB	$3.33	$8.33
Box	5GB	$9.99	$19.99
Dropbox	2GB		$9.99
Google Drive	5GB	$2.49	$4.99 (100GB)
Microsoft SkyDrive	7GB	$0.83 (27GB)	$2.08 (52GB)

You can also upgrade to 1TB for $49.99/month. When you upgrade to a paid account, your Gmail account storage also expands to 25GB(Currently it is 10GB). You can attach photos from Drive to posts in Google+, and soon you’ll be able to attach stuff from Drive directly to emails in Gmail.