PubSubHubbub

PubSubHubbub is a protocol that enables real-time updates for web content. It allows websites (publishers) to instantly inform subscribers about new or changed content without needing to check manually. When a publisher updates their content, they send a notification to a central hub. The hub then quickly broadcasts this update to all subscribed users or services. This system makes information flow faster and more efficient, reducing delay and server load, and is commonly used for news feeds, blogs, and other dynamic online content.