Directive to watch the size of an element inside the DOM. Usefull for example to provide a different layout (different components) depending on the available screen estate. You should first try to use CSS container queries but somtimes you need a different set of components to be loaded for a certain component size.
Let’s say you have components designed for bigger screens. You do not want to load them if there is not enough space for them. So you rather load components that are designed to take less space by providing the best user experience on smaller devices.
