Multiples in Japanese grammar are important for conveying quantities or showing the frequency of an action. Japanese counters are used to count different kinds of objects based on their shape, size, and type. Common counters include “tsu” (generic counter), “hon” (long, thin objects), “mai” (flat objects), “satsu” (books), “ko” (small objects), and many more. Learning multiples in Japanese is essential for clear communication and understanding daily life situations.