Google has developed a host of applications that they make available via the web. There are two main benefits to using these applications. First, they are web-based, so there is nothing to install, and second, your work is saved in an Internet location rather than your local computer, so you can access it through any computer with a browser and an Internet connection. Your files, documents, spreadsheets, presentations, etc., are all stored in your Google account online. Nothing needs to be stored on your local computer.
To get started, you need to create a Google account. If you do not have a Google account, go to Google's sign up webpage to open one.
Note: You do not need a Gmail account, just a Google account with your regular e-mail address. Just be sure to use your regular e-mail address when you create your Google account.