Cats meow and howl but they may also make chirping and trilling sounds as well. In most cases, these odder sounds mean that your cat is happy. For example, many cats chirp when they’re near their owners because they’re happy to see them.
Trilling noises often occur when a cat wants to greet you. Just as people greet one another with specific sayings, so do cats greet people with a specific noise. By deciphering your cat’s noises, you can better understand your cat’s moods so you can do your best to keep it as happy as possible, which is the goal of every cat owner anyway.