Ovitrap is a fancy word for a trap that catches mosquito eggs. You know how mosquitoes bite you and leave itchy bumps? Well, those mosquitoes also lay eggs in water, so the eggs can hatch into more mosquitoes.
Ovitraps are used to catch the mosquito eggs before they hatch. The trap has water in it that the mosquitoes like to lay their eggs in. The water also has a special substance that helps kill the eggs or stops them from hatching.
Scientists and mosquito fighters use ovitraps to find out where the mosquitoes are and how many there are. This way, they can help keep people safe from the diseases mosquitoes carry.
So, an ovitrap is like a special container with water and a special substance in it that catches mosquito eggs before they can turn into more mosquitoes.