The driveway, sidewalk and patio are prepped for concrete.  The soil is first staked off in the areas that will be poured, then compacted so there is a minimal chance of settling that would cause the concrete to crack.   Forms are staked up around the perimeter of the driveway, sidewalk and patio to allow the concrete to be poured directly in to the correct shape.  The forms are simply prices of 1x4 lumber attached to rebar stakes that are driven in the ground.  The drainage system clean out pipe is also visible, as it protrudes out of the center of the driveway.