We are using excel , word in daily life to manage our data like contact information , personal information , business documents etc.
We stored that data on our local computer so we need to take care about for backup of all this documents in case of system crash or in any other case by which we can lost that document.
Also when we need that documents on another system then we need to copy past that documents through USB or any other device.
Google docs is cloud based service to store our documents on Google’s server so we do not need to take care about to backup or system failure and we can access it from any computer or any location, You required only internet connection and Google account.
Take a look at http://docs.google.com (You can use your google credential).
More tips on google docs in future..
