First of all, before understanding pest control, we need to understand what are pests in easy common man language.
Pests are any living organism which causes damage, spread disease, cause nuisance value to human beings. Much as, people get scared by a few pests. Such as cockroaches, lizards, spiders, rats etc.
We are here mainly concerned with urban pests and not agricultural pests. These pests are such living organisms which causes disease, discomfort, damage, annoyance or just nuisance value. Therefore, the most common pests are cockroaches, termites, rats & mice,lizards, bed bugs, house flies etc.