Notifications
Lighthouse users rely on receiving push notifications to their devices to alert them to the latest information. Most proposals have a voting period with a time limit, which makes it extra important to catch your users' attention in a timely manner.
Topics
Users of your space can subscribe to received notifications for different topics, based on what they are interested in receiving. For example, a user might want to receive a notification everytime a new proposal, comes up for vote, but they might not want to be notified about every comment that is made.
As the space owner, you can create and managed the topics that your users can subscribe to. When you send out a messaging campaign, you can choose the topic(s) it relates to, and only users who have subscribed to that topic will receive the notification.