Cats have been domesticated for over 4,000 years and are now the most popular pet in the world. In the United States alone, there are an estimated 90 million pet cats. While cats are relatively easy to care for, they do require some basic upkeep. This includes providing them with food, water, shelter, and regular visits to the vet. In addition to their basic needs, cats also benefit from having toys, a scratching post, and a litter box. Cats are natural hunters and love to play.