Trim and moulding get used almost interchangeably by suppliers, installers and shoppers alike, which is exactly why so many people order the wrong piece for a kitchen splashback or a hallway skirting board.
If you have ever looked at a modular workbench, a machine guard or a CNC enclosure and wondered how it all bolts together so neatly, the answer is very likely T-slot aluminium.
Getting aluminium cladding to sit securely and look right on an external wall comes down to a handful of decisions made before the first panel goes up.
Order the wrong U channel size and you will know about it fast: a panel that rattles in its groove, a frame edge that will not sit flush, or a return trip to swap stock you have already cut into.