In English, "peripheral" or "peripheral device" refers to most devices that can be connected to a computer: keyboards, mice, digital cameras, external hard drives, webcams, etc.
Is there an equivalent word in Spanish?
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It's "periférico". It can be used both as a noun ("Un teclado es un periférico") and as an adjective ("Un teclado es un dispositivo periférico").
More information in wordreference.com.