The ListBox for Blazor represent a component which contains a list of selectable items. It supports external data and can contain checkboxes next to the items. In addition the ListBox can display the items in groups by using the item's group property. Filtering and right to left layout can be applied. The component enables single and multiple selection and initialization from DIV, SELECT, UL or OL. It supports full UI virtualization which minimizes the number of DOM elements that need to be rendered and improves performance in scenarios with thousands of list items.