The main difference is in their purpose: sticky bars stay visible as you scroll, notification bars share important alerts, and announcement bars promote key offers or updates.
Sticky Bar: Remains fixed at the top or bottom of the page, visible as the user scrolls, ensuring constant visibility for key messages.
Notification Bar: Displays alerts or updates, often without a call-to-action, and can be dismissible after the user acknowledges the message.
Announcement Bar: Primarily used for promotions or updates like sales or free shipping, with a focus on driving user action through clear CTAs.