There are two kinds of syllables: closed syllables and open syllables.
Closed syllables end with a consonant. Vowels in closed syllables are usually short.
Examples: cat, ten, kid, dog, cup, gym. (The final consonants are t, n, d, g, p, m.)
Open syllables end with a vowel, and the vowel is usually long.
Examples: name, he , I, no, glue, my.