Tabletop Simulator seems to be one of those games in which you play classic board games from the comfort of your own PC, saving the trouble of getting the real thing out of the box, and fussing over all the extras in the box, and deciding who gets to be the motorcar, the usual sort of thing. But Tabletop Simulator does more than that which makes it more appealing.
You could play chess with a friend for example. You move a piece, he moves, you take is knight, he takes your queen, then you throw a rook at his king. Literally. And your friend, so enfused with rage of you being a cheating conniving jerk, flips the table in anger, scattering the pieces to oblivion. Then you try a new game. Ludo perhaps. Adding the necessary parts; marbles, dice, mahjong tiles, RPG Dragon...
This is one of those games which may look serious, but seen from a different perspective and you have something that can be a great laugh for everyone. All the more, you can make your own games and put them directly into TS for everyone to try out. Which, to paraphrase NerdCubed, makes it an ideal platform for board game makers to test out their new games before they make physical copies. There is a lot that can be done, it's quite astonishing.
There is online multiplayer so you can play with friends across the web. Wouldn't mind seeing local hot-seat multiplayer in a future update, if it hasn't already been included.
If you haven't bought this game, I highly recommend you do. It is great entertainment for friends and families alike.