What does it mean when a red squiggly line appears in a typed word?

A red squiggly line under a typed Word typically indicates a spelling error or that the Word is not recognized by the Word processor's dictionary. This feature helps users identify and correct mistakes in their writing. If the Word is correct but still marked, it may be a less common term or a proper noun not included in the dictionary. Users can often right-click on the underlined Word for suggested corrections.