Microsoft applications include a feature that allows you to check the spelling and grammar of your documents.  Words are checked against a standard dictionary and unknown words are flagged for you to evaluate. You can choose to ignore the word, or correct it.

Word and PowerPoint automatically underline misspelled words in red and grammar mistakes in green. The red and green underlines will not appear when you print your document or show your slides.

Common spelling errors automatically corrected as you type. Some examples are: