Cordless phones are telephones that allow users to make and receive calls without being tethered to a wall outlet. They operate using radio signals, connecting to a base station that is plugged into a phone line. This design provides the convenience of mobility within a certain range, typically around 100 to 300 feet, depending on the model. Most cordless phones come with features like caller ID, voicemail, and multiple handsets that can connect to a single base. They are powered by rechargeable batteries, which can be easily replaced when they no longer hold a charge. Cordless phones are popular for home and office use due to their flexibility and ease of use.