Bridge Base Online (BBO) is an internet based bridge application where you can play bridge, play test hands, or even play on you own. You have to register with the site, but the service is essentially free to use. (There may be some discreet advertisements, see Hide Adverts)
You can access BBO through any web browser and there is also an app that you can use with smart phones and tablet computers. To access the app, go to your app store and search for bridge base. Bridge Base Online should appear and you can install it in the normal way.
This document is intended to help you get set up (see Create a username and password) and to show some of the features including playing on your own (see Solitaire), playing with partner (see Playing Bridge with your partner) and setting up a private table for you and your friends (see Start a Table).