* Microsoft Word: A red wavy underline is often used to signal potential spelling errors, while a green wavy underline indicates potential grammatical errors.
* Google Docs: Google Docs also uses red wavy underlines for potential spelling errors and green wavy underlines for potential grammatical errors.
It's important to remember: These color-coded underlines are suggestions, not definitive pronouncements. You should always review the suggested changes and decide if they are appropriate for your document.