to the list because the finite state machine based filter in which this list is intended to be used is able to filter them at almost no cost. The final product is a list of 421 stop words that should be maximally efficient and effective in filtering the most frequently occurring and semantically neutral words in general literature in English. In SEO terminology, stop words are the most common words that many search engines used to avoid for the purposes of saving space and time in processing of large data during crawling or indexing. For some search engines, these are some of the most common, short function words, such as the, is, at, which, and on. In this case, stop words can cause problems when searching for phrases that include them, particularly in names such as "The Who", "The The", or "Take That". Other search engines remove some of the most common words—including lexical words, such as "want"—from a query in order to improve performance. In recent years the SEO best practices around stop words have evolved along with the fields of machine learning and natural language processing. In February 2021, John Mueller, Webmaster Trends Analyst at Google, Tweeted the following, "I wouldn't worry about stop words at all; write naturally. Search engines look at much, much more than individual words. "To be or not to be" just is a collection of stop words, but stop words alone don't do it any justice." See also Concept mining Filler (linguistics) Function words Index (search engine) Information extraction Natural language processing Query expansion Stemming Text mining References External links List of English Stop Words (PHP array, CSV) Full-Text Stopwords in MySQL English Stop Words (CSV) Stop Words Indonesia Query PHP Array German Stop Words,German Stop Words and phrases, another list of German stop words Polish Stop Words Collection of stop words in 29 languages (archive) List of Hindi Stop Words Information retrieval techniques