assembling collections of tools, widgets, and services that handle developing and organizing dynamic online content

tailored to their own needs and interests: the personal web.

Applications

programs on a desktop computer use that single computer as a platform

Cloud-based applications do not run on a single computer

spread over a distributed cluster, using storage space and computing resources from many available machines as needed

cloud is changing our ideas about computing and communication.

the cloud is robust and reliable

often free and come with huge amounts of storage space

many of us use such applications daily without even being aware

The cloud refers to computing resources resulting from very large “data farms” — specialized data centers that host thousands of servers

anyone can obtain it