Pinyin, short for Hanyu Pinyin, means "phonetic notation" or "phonetic symbols". It is a system of romanization (phonemic notation and transcription to Roman script) for Standard Mandarin. There are 21 initials/consonants and 35 finals/vowels in Mandarin.
Pronunciation of Mandarin comes with two aspects: syllables and tones. Each can be practised separately, but when it comes to speaking, learners must pronounce words with proper tones.
A Mandarin syllable consists of three components: an initial, a final and a tone. The initial and final sounds make a total of 56 basic sounds. Combinations of initials and finals, and the special cases result in more than 400 mono-syllabic sounds. By applying the four tones to the sounds, Standard Mandarin makes a total of around 1,600 unique syllables.