Adult cats in the wild rarely meow at each other; they communicate more through scent and body language. However, domestic cats discovered that humans are more sensitive to sound, so they evolved “cat language” to communicate with their owners!
Kittens meow to call their mothers, but adult cats typically communicate silently.
Different meows may indicate different needs—for example, a short “meow” might be a greeting, while a prolonged “meow~~~” could mean they’re hungry.