SharePoint Cascaded Lookup is a component which allows users to lookup FILTERED information from other lists of different sites.SharePoint default lookup allows users to lookup other list. If column A lookup column B, we call column B as Looked-up Column. When users edit/create an item, all the values of Looked-up column will display as choices in dropdown list of lookup column.SharePoint Cascaded Lookup introduces Filter Column and Parent Column to filter field values so as to narrow the range of choices. With it, you can lookup field values more quickly and accurately.Filter Column is in the same list with the looked-up column. As the name goes, if you set a column as Filter column for the looked-up column, when you edit/create an item, the choices of the cascaded lookup column will be filtered according to the value of the Filter Column.Here are some key features of "SharePoint Cascaded Lookup":