Can one device combine the functions of a router and a switch?

Question

Computer networks

Today I know that one device can combine several functions - the functions of a router and an access point.

Can one device combine 2 functions - switching functions (frame transmission method) and routing functions (route selection for frame transmission)?

If so, can any device (PC, smartphone, for example) act as a switch or router?

Answer 1

Yes
Yes

Answer 2

And there is such a necessary machine as a switch with support for L3 functions (L3 Switch), which is a real router with a bunch of ports, but still a switch. And also such a beloved trash 840 tp-link is a switch, a router and a wi-fi access point.