The answer to 'why do I have rat' is that rats may have infested your home due to a variety of reasons, such as easy access to food sources, shelter, or nesting materials. Rats are opportunistic and will seek out any available resources in a home or surrounding area.
Common signs of a rat infestation include droppings, gnaw marks, nests, and noises like scurrying or squeaking. Rats can cause damage to property, contaminate food, and potentially spread diseases. It's important to address a rat problem quickly to prevent further issues.