ngrok is a platform that provides secure connectivity for applications and APIs. It allows developers to serve and manage traffic globally for their apps running in various environments such as cloud, on-premises, or customer networks. ngrok offers solutions like API Gateway, Global Load Balancer, Identity-Aware Proxy, and Kubernetes Operator to enhance security and functionality without the need for complex network configurations. The platform supports a wide range of use cases including webhook testing, device gateways, and site-to-site connectivity, making it an essential tool for developers looking to streamline secure access to their services.