Spell Check is a software feature that automatically identifies and corrects spelling errors in text. It works by comparing words in a document against a built-in dictionary. If a word is misspelled, the program suggests corrections, helping users produce error-free writing. Most word processing programs, like Microsoft Word and Google Docs, include spell check functionality. Users can enable or disable this feature according to their preferences. Additionally, many web browsers also offer spell check to ensure that online writing, such as emails or social media posts, is accurate and professional.