Stop word removal is an additional common step, where by frequently used terms like "is" or "the" are filtered out because they Really don't include major meaning to the textual content. Stemming or lemmatization reduces terms to their root form (e.g., "managing" will become "operate"), which makes it less difficult https://stephenbeimr.ageeksblog.com/35171681/the-ultimate-guide-to-machine-learning