👉 A stemmer is a type of algorithm that converts words into their base form, which is the smallest unit of speech recognized by a language. The term stems refers to the group of words formed from the base form and can be any part of speech including nouns, verbs, adjectives, etc. For example, in English, the stem "cat" (noun) is formed from the base "c." In this context, the stemmer would convert the base "c" into the word "