Microsoft just released a new Office beta app for Android that combines all the essential office tools. This includes Word, Excel, PowerPoint, etc. In fact, the app itself is called Microsoft Office: Word, Excel, PowerPoint & more.
As you'd expect, the app will let you create, edit documents and manage documents on your Android phone or tablet. You can even collaborate on certain documents with friends and colleagues through the app. Something like Google's Sheets, Docs, etc.
One standout feature is the ability to create PDF files from a photo or convert Word, Excel and PowerPoint files into PDF. Signing the latter with your finger and then sending is also possible.
You can find the app right now on Google Play Store but it might be a bit buggy at first since it's still early access.