Is the Nintendo Switch portable?
Yes. The Nintendo Switch can be portable. That's part of the beauty of the "Switch" name. It is designed to be a home console and easily connect to your TV, but it can also be very simply undocked and carried with you... so you have the benefits of a home console AND a portable gaming system.
Nintendo 3DS is a portable game console produced by Nintendo. The autostereoscopic device is able to project stereoscopic three-dimensional effects without requirement of additional accessories. The console succeeds the Nintendo DS series of handheld systems, which primarily competes with Sony's PlayStation Portable. The Nintendo 3DS features backward compatibility with Nintendo DS series software, including Nintendo DSi software.
A PSP (PlayStation Portable) is an older model handheld console from Sony Computer Entertainment INC and sold under the PlayStation family of products, while Nintendo is the name for the product line that includes the Wii console and newer Nintendo Wii U console and the Nintendo DS and newer Nintendo 3DS portable game players.