Merlin is a tool that allows users to access the vast knowledge of the internet using the power of OpenAI ChatGPT Plus. With Merlin, users can leverage the AI-powered language processing to enhance their experience on their favorite websites, including Google searches, Gmail, and Google Sheets. The tool also allows users to effortlessly summarize content on any website, making it easier to digest and understand. Merlin essentially brings the knowledge of the internet to your fingertips, making it easier and faster to find and share information online.