Pinggy is a platform that allows users to generate public URLs for services running on their local machines, enabling external internet access. This functionality supports various applications such as web hosting, webhook reception, file sharing, and connecting to devices like Raspberry Pi directly from a user's laptop. Users can create a tunnel from their local environment to the public internet through a single SSH command, which facilitates exposing local services online without complex setup processes like port forwarding, cloud deployment, or VPN configurations.