Have you ever seen your mommy water the plants with a hose that has a thingy at the end that sprays water like a shower or a mist? That thingy is called a spray nozzle.
Just like you take a bath or shower and the water comes out of the showerhead in different ways, a spray nozzle does the same thing. It helps water come out of the hose in different ways too!
Sometimes, when the plants need a lot of water, you can use the "shower" option to spray water all over them. Other times, when you don't want to use too much water or you want to reach a far distance, you can use the "jet" option, which sprays water in a straight line.
A spray nozzle is like a special tool that makes watering plants or cleaning easier because you can adjust how the water comes out by just turning the nozzle.