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A cordless telephone or portable telephone is a telephone with a wireless handset that communicates via radio waves with a base station connected to a fixed telephone line, usually within a limited range of its base station (which has the handset cradle).

Cordless phones operate on frequencies mandated by the FCC. There are four major frequency band options: 43-50 MHz, 900 MHz, 2.4 GHz, and 5.8 GHz. Cordless phone bases and receivers operate over two closely located, but different, radio frequencies.

DECT phone is a cordless phone that works with your landline phone line.  A DECT phone has a base and one or more handsets. The base phone is like any telephone set, with a PSTN phone line connected to it. It radiates signals to the other handsets, wirelessly connecting them too to the PSTN landline.