Most tablets have a USB connection for charging and/or data transfer. In theory the USB connector could be used to link to a printer.
This is rather going against the design ethos of a tablet though since the current vogue is to use wifi or Bluetooth to connect to other devices wirelessly. This is great for allowing the tablet to be used anywhere around the house. The pop up on screen keyboards of most tablets are fine for typing short messages or notes.
Don't be tempted to regard a tablet computer as a complete replacement for a desktop or laptop computer, it isn't, but some do get fairly close.