The GPT Yellow Page Sidebar serves as a centralized hub for various GPT (Generative Pre-trained Transformer) applications including GPT4 and ChatGPT. By adding the extension to the Google Chrome browser, users gain quick navigation capabilities to diverse AI tools, enabling them to better leverage AI technologies in their tasks. With an intuitive sidebar interface, the extension keeps resources organized and accessible, making it easier for users to engage with multiple AI applications without switching tabs or windows.