Differentiate stemming from lemmatization.
Stemming basically chops off the beginning or end of a word to bring it in its base form. Such chops are generally prefixes of suffixes and they are not accurate always.
On the other hand, lemmatization converts every word into their root or base form no matter whatever the word is taken into account.
In stemming, the word ‘babies’ will be converted to ‘babies’ removing the suffix ‘es’ which indeed made the word not so meaningful. But in lemmatization, the same will be converted to ‘baby’ which makes a difference.