If you wish to find information on Symantec products, please go to the main Symantec.com page as given in the URL below.
Specifically with Symantec.cloud:
More Document you can View Mithun Articals.
Symantec.cloud essentially offers cloud based solutions for several of your on-premise solutions. The benefit being that they can all be configured and monitored from the 'cloud' - i.e. an online portal, so if you are working remotely you can still gain access to run reports, change configurations, view status', etc, that you can't do with the on premise version.
.Cloud's most popular product is the Email Security.cloud - this service provides scanning for emails in the areas of Anti Virus, Anti Spam, Image Control and Content Control (services can be purchased seperately or as bundles).
.Cloud also offers a fantastic URL filtering service to protect you from Virus' and Malware while browsing, but also allows clients to control and report on sites their staff members visit.
I hope this helps - please let me know if you have any further queries.