Online collaboration tools are applications that allow team members to communicate and work together to accomplish their goals without needing to be in the same place at the same time. Those tools can include cloud storage software like Dropbox, video-conferencing software like Zoom, project management software like Asana, text editor software allowing users to work on the same document together like Goolge Docs, etc. Some programs only provide one function, while others (like Google Workspace or Microsoft 365) offer a whole set of online tools for communication and collaboration.
All of us encountered sites asking us to subscribe to their notifications. While that can be a useful functionality in some cases (when an email provider is informing us of new emails, for example), most of the time notifications from websites are superfluous and not especially useful. There are also sites that try to force users into turning on their notifications and using these notifications to later spam users with questionable links, ads for shady sites, prompts to download fake software updates, and so on.