The Dashboard, a feature that showed widgets of information over the Desktop or on a deparate space, will no longer be part of macOS start with Catalina later this year. The feature has been around since OS X Tiger in 2005, but was depreciated in Yosemite where it was turned off by default. Some of the same widgets are now available in Notifications Center in recent versions of macOS.
Few people used the Dashboard, but some that did were heavy users. Most, if not all, features of Dashboard can be had in other parts of macOS, web pages, or third-party apps.
