As with any printer technology, lasers can be either single-function or multifunction printers (MFPs), aka all-in-ones (AIOs), which is to say they can be limited to printing only, or they can add scanning at a minimum, usually copying, and often faxing as well. Either type can be a mono-only printer, or either can print color.

In a lot of scenarios, it makes good sense to pick a single-function laser printer rather than spend more money to get what is sometimes the same printer with a scanner added. Consider whether you need heavier-duty scanning (including scans for copying and faxing) than an AIO can handle. If so, you'll need a separate scanner, anyway, which will likely make the extra functions of an AIO superfluous. Similarly, if you already have another AIO (or a copier and a fax machine), consider whether getting a second AIO will add any convenience or capability.

At the other extreme, you may scan so little that you can take care of the occasional capture with a scan app on your phone or just take photos. Unless you need to scan files to PDF format or use optical character recognition (OCR) to turn the scans into text files, you'll probably be scanning to the same JPG format that photos use, anyway.

Printer-only models are available in the entire range from inexpensive monochrome units meant for home office (or hybrid work), micro-office, or student use to floor-standing printers (mono and color) that hold thousands of sheets of paper in multiple paper drawers at once. (The latter are suitable for large workgroups or entire departments.) In between are mono and color models designed for home and micro offices, as well as models for small offices and workgroups.

The added functions in laser AIOs are the same as in inkjet AIOs, with the same potential variations. Almost all print, copy, and scan. Many fax, as well, and scan-to-email features are common. The copying, faxing, and emailing can be limited to standalone capability, through the computer only, or both. And so on.

One common misunderstanding about mono laser AIOs is to think that the scanning they can do is also monochrome only. In truth, with a theoretical exception of some oddball model we haven't seen, the scanners on any AIO today can scan in color.

Compared with inkjet AIOs, the advantages of laser AIOs include higher quality text, most noticeable at small font sizes, and smudge-proof output. Color laser AIOs also offer more vibrant color when printing on plain paper. However, know that although mono laser AIOs can handle schematics and other simple line drawings well, their output quality for graphics otherwise is often no better than serviceable.

Whether single-function or multifunction, the range of monochrome lasers runs from small, inexpensive models with modest paper handling suitable for personal desktop printing in any size office, all the way up to multi-thousand-dollar models offering speed, durability, and paper handling meant for high-volume printing in a busy, large office. Color lasers add vibrant color graphics. And, as already mentioned, in addition to their high-quality text and graphics, many color lasers can print photos well enough for brochures and other marketing materials, allowing many companies to take such printing in-house.