Much like a touch-screen smartphone, tablets use touch as their primary means of input. And just like a smartphone, that screen is something you will want to protect. Scratches not only look unsightly, they can damage the tablet's functionality.
A great, inexpensive option is the clear plastic film that fits over the screen and protects it from scratches. Some of these screens also reduce the glare on the screen so they're more usable outside. These can range in price from $5 to $20.
If your tablet is going to be seeing some heavy-duty work, a case with a clear plastic screen might be the way to go. Many of these will also let you use the touch pad screen without removing the cover.
In our next and final section: Should you add a pen to your tablet computer?