Why do deserts form around areas near the tropics but not the equator

You see, we are more likely to find tropical rainforest and jungles on a hot and sunny location like on the equator. In fact, desert doesnt always have to be hot at all, for instance, the antarctica. Deserts are formed on locations with different climates and less precipitation. And unlike the locations on the equator, which receives high amount of rainfalls, deserts receive way too little, thus, affecting the vegetation and growth in the area.