DayMate is a lightweight AI-powered daily planning assistant built with React, Node.js, Express and Groq AI. Users can add, complete and delete their daily tasks. When they click 'Plan My Day with AI', the React frontend sends the tasks to an Express backend through a POST API. The backend securely handles the Groq API key using environment variables and sends the user's tasks to an LLM with a structured prompt. The AI generates a short and realistic plan for the day, which the backend sends back to React and displays in the UI.