A Push API is a web service that allows servers to send real-time updates or notifications to clients without the clients needing to request the information. This is particularly useful for applications that require immediate data, such as messaging apps or news services. By using a Push API, developers can ensure that users receive timely updates, enhancing the overall user experience. The Push API works by establishing a connection between the server and the client, often using technologies like WebSockets or HTTP/2. When new data is available, the server can "push" this information directly to the client, allowing for instant communication. This contrasts with traditional methods where clients must regularly check for updates, which can be less efficient.