What are the uses of a sprayer?
Answers: To spray chemicals on plants to control insects and diseases. Also used for weedkiilers, use seperate sprayer for this purpose.
There are lots of different kinds of sprayers but I gather from your other question you are interested in the agriculture type. There are all different sizes from smaller than a quart to giant tractor mounted unit that can cover many feet at once. However, they are adjectives used for the same purposes. To spray liquid fertilizers, insecticides, herbicides, or fungicides.