Each Japanese syllable is made up of either a single vowel: a,i,u,e and o or a combination of a consonant plus a vowel.
The only exception is the n, m or ŋ sound which is represented by the character ん.
There are 46 basic Hiragana, 25 voiced or semi-voiced variations (called “Daku-on) and 33 contracted sounds. Here, “voiced” means you use your vocal cords to pronounce them. It begins with the consonants b, d, g, j and z and semi-voiced ones begin with p, that we call Daku-on.