Dell Monitor Series
S Series: S is for Studio, usually they are designed to have sleek looks,
so thin bezels, edge to edge, glass, glossy panel, things like that. These usually have IPS panels.
P Series: P is for professional. These are all IPS panels,
they are designed for businesses and offices in mind,
with good ergonomic adjustable stand,
DisplayPort and DVI inputs, though not sleek thin bezels or higher end features like daisy-chaining.
U is for UltraSharp, Dell’s premium line.
These are all IPS panels, and basically are a step up from the P series,
adding features like daisy-chaining, more advanced color control in the OSD,
more inputs, factory color calibration, though the specifics vary from model to model.