The Google Books Ngram Viewer is an online search engine that charts the frequencies of any set of search strings using a yearly count of n-grams found in printed sources published between 1500 and 2022[1][2][3][4] in Google's text corpora in English, Chinese (simplified), French, German, Hebrew, Italian, Russian, or Spanish.[1][2][5]
There are also some specialized English corpora, such as American English, British English, and English Fiction.[6]
The program can search for a word or a phrase, including misspellings or gibberish.[5] The n-grams are matched with the text within the selected corpus, and if found in 40 or more books, are then displayed as a graph.[6] The Google Books Ngram Viewer supports searches for parts of speech and wildcards.[6] It is routinely used in research.[7][8]