We cut down rainforests for wood and space. Rainforests take a lot of space and as population grows people need to cut it down for space where they will build schools, roads, and houses.
The wood is used to build stuff which gives more jobs to the community. The wood is used to make paper. The paper is used in the schools and other places.
The animals need the rainforests for food. People use the rainforests for food too. Plants being cut down is bad because people can't use the plants for medicine.