The SLS Universal Adapter is one of two large-to-medium connectors that officially forms part of the Space Launch System, but it can be used on any large rocket. It differs from the SLS Payload Adapter by its shape and its colour, as well as how it detaches into two parts like a fairing.
It also differs by how it separates, as it detaches automatically as the first stage separates. Unlike its sister fairing, this one uses clamshell separation. It's also the only large fairing that can cover payloads.