Family Feud is modeled after the successful TV show that was first aired in 1970. It's still on the air today, hosted by none other then Richard Karn (better known as Al, Tim 'The tool man' Taylor's sidekick on 'Home Improvement') and appears to be quite popular. The concept is well-known and copied by many TV-shows in other countries as well (for instance '5 tegen 5' in the Netherlands). Basically, there are two teams (both families consisting of a father, a mother, a brother and a sister who compete against each other in four rounds (father vs. father etc.). You can play against the computer or against a friend (hotseat).
For every round there's a question that's based on a survey, like "Name a vegetable you can marinate" (I don't know if they actually did field research for the game but that's another story...). Depending on the number of people that gave the same answer as you do, you're rewarded with points. If you make a mistake, the other team gets to play. If they mess up, you win the round after all. Winner is the team with the most points.
That's all fairly simple and Family Feud delivers a good simulation of the TV-game, but there are some strings attached: in order to answer the questions you really ought to have a solid understanding of English. How many people can name all the different vegetables in another language AND know how to spell them properly? This makes the game very difficult for many non-native English speakers. It's still fun though, but prepare yourself to miss a few question purely because you didn't know how to spell cauliflower...