Microsoft Office for iPad

Yes, it's available. No, it's not free.

You can download the apps (Word, Excel, Powerpoint, OneNote) from the App Store. They are free.

Then, when you open the app, you'll discover the string attached to it; you need a subscription to Office 365.

The subscription is ~$10/month. It automatically saves on the cloud all the documents you create, either on your iPad or your  Microsoft Office applications on your  computer. It also syncs between your devices.

iWorks, the Apple version of Office does this for free. Pages (Apple word processor, not quite as versatile as Word), Keynotes (Apple version of powerpoint), Numbers (Apple version of Excel) are all free apps (if you bought your device after Sept 1, 2013. Otherwise it is ~$10 for each app). They automatically save your documents on iCloud and sync between your devices. Your documents can be exported in Microsoft Office format and iWorks will open Office documents.  

The choice is yours.

                                                                                                                                 Jude