Platform Bed Frame – Platform bed frames come in a variety of styles, and they either feature horizontal slats (think planks, usually wooden) or a solid platform for the mattress to rest on.
Slatted Bed Frame – A slatted bed frame is another way of saying platform frame and gets its name from the characteristic horizontal slats that support the mattress.
Slats – Slats are the planks that are usually placed horizontally on a slatted or platform frame. Their purpose is to support the mattress and their function is analogous to that of a box spring.
Metal Bed Frame – Sometimes called a Hollywood bed frame, the metal frame is a traditional bed frame that supports a box spring + mattress.
Box Spring – Traditionally featuring a wooden frame and springs, most modern box springs are, in fact, slatted or solid foundations. Their purpose is to provide even support under the mattress, and they work with either a metal bed frame or a platform bed.
Solid Foundation – A solid foundation provides the support of a platform frame or slats, though it looks very much like a box spring and is used the same way: metal frame + solid foundation + mattress. Most modern box springs are solid or slatted foundations.