Grammar Girl is a popular online resource created by Mignon Fogarty that provides tips and advice on English grammar, punctuation, and style. Launched in 2006, it aims to help writers improve their communication skills through easy-to-understand explanations and practical examples. The platform includes a podcast, blog, and various books, making grammar accessible to a wide audience. Grammar Girl covers topics ranging from common grammar mistakes to writing techniques, appealing to both novice and experienced writers seeking to enhance their language proficiency.