What is terrace farming?

Question

I know its when steps are cut into the mountain, but how does that make the area suitable for growing crops?

Answer 1

Terrace farming is also in the city, when apartment owners only have a terrace to use for growing/planting.............

It's been done in New York for years, also on the roof tops.

Answer 2

On a steep hillside, the farmers dig into the hill to flatten out an area so the water will not run down the hill.  The hill will eventually look like a large staircase because of the terraces.

Answer 3

By helping avoid soil erosion.  It keeps the land there.