Wireless networks are particularly susceptible to eavesdropping because the data is transmitted over radio waves, which can be intercepted by unauthorized individuals if the network is not secured. Encryption ensures that even if data is intercepted, it cannot be understood without the correct decryption key. Wired networks, while they can also be vulnerable to other forms of interception, do not broadcast data through the air and therefore are generally not susceptible to eavesdropping in the same way as wireless networks. Bluetooth networks also use radio waves but on a more limited range and are typically used for connecting devices over short distances, while NFC is used for very short range communication such as contactless payments.