Orthogonal Frequency Division Multiplexing (OFDM) is a digital communication technique that divides a single data stream into multiple smaller streams, which are transmitted simultaneously over different frequencies. This method helps to improve data transmission rates and reduce interference, making it ideal for high-speed internet and wireless communication systems. In OFDM, the frequencies used are closely spaced but remain orthogonal, meaning they do not interfere with each other. This allows for efficient use of the available bandwidth. OFDM is widely used in various technologies, including Wi-Fi, 4G, and 5G networks, enhancing their performance and reliability.