SSL Certificates enable Web Push Notifications
Web push notifications or Website push notifications work only via an HTTPS connection with the website. An HTTPS connection is possible only after a SSL certificate is installed for your website.
Once the website loads via HTTPS, then web push notifications will be shown based on web browser push notification capabilities. Currently web push notifications are supported on Chrome (version 42 and above) & Firefox (version 44 and above) on the desktop, and the latest Opera for Android. On mobiles, the technology is available only on Android OS on Chrome.
Once setup you can reach your audience on their browser at a time of your choosing and send interest-based & personalised communications.
Use of Web Push notifications is a prerequisite to creating a Progressive Web App (PWA). Hence, enabling HTTPS is a must to create a PWA.