https://learn.microsoft.com/en-us/dotnet/api/system.web.ui.webcontrols.webparts.catalogzone?view=netframework-4.8.1&redirectedfrom=MSDN
CatalogZone Class (System.Web.UI.WebControls.WebParts) | Microsoft Learn
Serves as the primary control in the Web Parts control set for hosting CatalogPart controls on a Web page.
class systemweb uiwebpartsmicrosoftlearn