Geographical questions, why do fields in some areas look like ladders? What are the benefits?

In rainy and mountainous areas, terraces are generally built on the mountains ~ These places lack flat farmland ~ The shape of terraces is mainly to prevent soil erosion ~ If crops are directly placed on sloping hillsides ~ When the rainy season comes, farming may be washed away by rainwater flowing down from the mountains, and irrigation water sources cannot be stored ~ At the same time, sloping hillsides cannot grow rice, a crop that needs a big pond ~ So local residents build terraces to grow food to store water sources ~