It's like a phone and a simple computer combined into one to put it very simply.
Free and paid Apps (applications) to do things like the following:
- Calendar / organizer
- GPS (if you drive)
- Map function
- Surf Internet
- Play simple games
- Listen to music
- Watch videos
- Twitter
- Facebook
- Track income and expenses
- Track stocks
- Check weather
- Read News
- Read books (like with Kindle app)
Now-a-days the smart phone is being used for several usage like calling, messaging, gaming, net surfing, navigation, document editing, entertainment…etc