Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answered 3 months ago

There are several surviving recitations (qira'at) of the Qur'an with very minor differences (mostly related to pronunciation such as a vowel sound or dots). Most of them are unused.

The differences typically have little impact on the meaning, although may be considered in jurisprudence or tafsir.  

This is not considered to be tahrif (alteration) of the Qur'an, especially since it is nearly inconsequential. 

In Sunni hadith, the Qur'an is said to have been revealed in seven dialects (ahruf).

The Shi'i view is that there is only one original correct revelation and recitation, even if, in reality, there exist multiple qira'at