Transmission techniques refer to the methods used to send and receive data over various communication channels. These techniques can include wired methods, such as fiber optics and copper cables, as well as wireless methods like radio waves and microwaves. Each technique has its own advantages and limitations, affecting factors like speed, distance, and reliability. In digital communication, modulation techniques are often employed to encode information onto carrier signals. Common modulation methods include Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Shift Keying (PSK). These techniques help optimize the transmission of data, ensuring that it can be accurately received and interpreted by the intended devices.