Orthogonal Frequency-Division Multiplexing (OFDM) is a digital communication technique that divides a single data stream into multiple smaller streams, each transmitted simultaneously over different frequencies. This method helps to reduce interference and improve data transmission efficiency, making it ideal for high-speed networks. OFDM is widely used in various technologies, including Wi-Fi, 4G, and 5G mobile networks. By utilizing closely spaced subcarriers that are orthogonal to each other, OFDM minimizes the risk of overlapping signals, allowing for better use of available bandwidth and enhancing overall communication performance.