As seen on the expertly-drawn badminton court below, there is a dark red box. During general play the shuttle must land within the opposing player's red box. On the line is in, meaning if any part of the shuttle touches the line (even if it's the edge of the feathers) the point is counted.
The light red shaded area indicates the service area. The shuttle must land in the diagonally opposite side of the court.
The blue box indicates the doubles court for during general play. Similarly, the light blue shaded area indicates the service area. Note that the service area is short and wide in comparison to the singles court.