Modulation is the process of converting data into radio waves by adding information to an electronic or optical carrier signal. Modulation is usually applied to electromagnetic signals, including radio waves, lasers/optics, and computer networks. There are many common modulation methods, including amplitude modulation (AM), frequency modulation (FM), and phase-shift keying (PSK) .

However, none of the sources provide a clear answer to the question of what modulation type is used for computer networks. Source mentions line coding, which is the modulation of an electrical charge so that each side of a connection knows what is a one and what is a zero. Source asks what type of modulation is used by twisted pair cable computer networks, but does not provide an answer. Source lists line coding as one of the options for the question "What modulation type is used for computer networks?"

Based on the available information, it seems that line coding is a type of modulation used for computer networks. However, it is important to note that this answer is not definitive and may not be accurate.