Smartcar is a standard API for connected vehicles that enables web and mobile app communication with cars across multiple brands without any hardware. Developers can register their applications on the Smartcar developer dashboard, add a "Connect your car" button to their apps, authenticate users with their cars using the Smartcar authorization flow, and receive a token to make HTTP requests to the car via the Smartcar API. When issues arise, Sentry helps Smartcar resolve errors quickly by providing stack traces, release information, car brand data, and request source details. The platform focuses on minimizing time for developers to log in, register applications, and make first requests to the API, ensuring a seamless experience.