Pinyin
There are many reasons to learn how to divide Pinyin into syllables. Separating a word like Pinyin into syllables is mainly to make it easier to read and pronounce. The syllable is the smallest sound unit in a word, and the separation of the Pinyin into syllables allows speakers to better segment and emphasize each sound unit.
Knowing how to separate Pinyin into syllables can be especially useful for those learning to read and write, because it helps them understand and pronounce Pinyin more accurately. Furthermore, separating Pinyin into syllables can also be useful in teaching grammar and spelling, as it allows students to more easily understand and apply the rules of accentuation and syllable division.
In the case of the word Pinyin, we find that when separating into syllables the resulting number of syllables is 1. With this in mind, it's much easier to learn how to pronounce Pinyin, as we can focus on perfecting the syllabic pronunciation before trying to pronounce Pinyin in full or within a sentence. Likewise, this breakdown of Pinyin into syllables makes it easier for us to remember how to write it.