Briefly, the prefix is using ‘in, on or not’ in various English vocabularies. Examples are insane, inject etc.
In English Grammar, we add prefixes to the beginning of the word. This will create a new word with a different meaning. Prefixes will also create new words which have the opposite meaning to the root word. Addition to that, they can also make negative words.
The suffix is a letter which will add to the end of a word. The suffix will also make a new word with different meaning but also serving an inflectional ending. Examples are veracity, funny, rainy etc.