Cats communicate with each other through a variety of vocalizations, scent marking, and body language signals. Common cat body language signals include twitching their tails, arching their backs, hissing, growling, and flattening their ears. Additionally, cats may also use facial expressions such as making direct eye contact or narrowing their eyes to communicate with each other. By understanding these signals, owners can better understand their cats and create a strong bond with them.