The answer to 'why is my ant infestation' is that ants are attracted to your home for a few common reasons: food sources, moisture, and nesting sites. Ants are searching for food and will find their way into your home through the smallest cracks and crevices. Spills, crumbs, and pet food can all attract ants. They also need water and will be drawn to leaks, damp areas, or even condensation. Finally, ants may nest in wall voids, under floors, or in other protected areas around your home.
The first step is to identify the type of ant you have, as that will determine the best treatment approach. You may be able to manage a small ant problem with DIY methods, but for larger infestations or difficult-to-control ant species, it's best to call a professional pest control technician. They have the expertise and tools to properly identify the ants, eliminate the nest, and prevent future infestations.