Domestic cats primarily communicate with each other using body language, vocalizations, and scent marking. Meowing is a vocalization that is more common in kittens and is used to get their mother's attention. As cats grow older, they tend to use meows more in communication with humans than with other cats. This behavior can be attributed to several reasons:

Attention-seeking behavior: Cats meow at humans to get their attention when they want something, such as food, water, or play. Humans often respond to meows by providing what the cat desires, reinforcing this behavior.

Establishing a bond: Meows can also be a way for cats to establish a bond with their human companions. Some cats may meow to express affection or simply to be acknowledged by their owners.

Lack of understanding of human language: Cats do not inherently understand human language, so meowing can be their attempt to communicate with us in the only way they know how.

However, it is essential to note that meows are not the primary means of communication between cats. In their interactions with other cats, they mostly rely on body language, scent marking, and a variety of vocalizations, including chirps, hisses, trills, and growls, which serve different communicative functions.