As you type, you soon notice red and green wavy lines. The red and green wavy lines indicate that Word found a spelling or a possible grammatical error. Word is not perfect, just helpful, and sometimes Word incorrectly flags such errors when they are not really errors. This hour is already up, so for now just understand that the wavy lines mean that possible misspellings or grammar problems occur in your text. In Hour 4, "Managing Documents and Customizing Word 2003," you'll learn how to use the spelling and grammar checker.