In the classic web version of Dynamics 365 for CE, user were able to highlight data from Views and quickly be able to copy and paste that to other target sources such as emails/chat windows etc. This allows easy converse of data between different places and allows chat experience more fluid when providing updates to the customers.
Example where this would be extremely beneficial for:
Being able to quickly copy and paste Case Numbers to team members and other service providers.
Being able to quickly copy titles and then searching for existing or similar cases.