Carcassonne is one of the first games we played, and it has remained an all time favourite. With the number of expansions that there are, there is never a boring game. You pick tiles out of a bag and place them on the table in the place you choose. In each variation you try to collect points for different things by putting your meeple on the tiles. Collect and finish as many things are you can to try and claim the most points.
"Carcassonne is a tile-placement game in which the players draw and place a tile with a piece of southern French landscape on it. The tile might feature a city, a road, a cloister, grassland or some combination thereof, and it must be placed adjacent to tiles that have already been played, in such a way that cities are connected to cities, roads to roads, etcetera. Having placed a tile, the player can then decide to place one of his meeples on one of the areas on it: on the city as a knight, on the road as a robber, on a cloister as a monk, or on the grass as a farmer. When that area is complete, that meeple scores points for its owner."