What is a 'Riser Card'

[Mangetout]

I keep seeing ‘PCI Ethernet Riser card’ or ‘Modem Riser Card’ advertised in online stores, what is a riser card?

[therealblaze]

A riser card is normally used in a low profile case. Instead of the cards being perpendicular to the board, a riser card is used to make them parallel to the board, saving on the height.
Source

[Ms2001]

from this page:

AMR (Audio/Modem Riser) is a specification developed by Intel for packaging the analog I/O audio functions of modem circuitry together with a codec chip (which converts back and forth from analog to digital) on a small board that plugs directly into a computer’s motherboard.
…
Because getting certification for the manufacture of a new motherboard design is a lengthy process, removing this function from the motherboard provides more flexibility for manufacturers and allows advances in audio modem design to be implemented more easily.

[Eryi]

Where these not just called ‘Daughter boards’ back when the Amiga was still prevelent in the US?