DSSS, or Direct Sequence Spread Spectrum, is a modulation technique used in wireless communication. It spreads the signal over a wider bandwidth than the minimum required, which helps reduce interference and improve security. DSSS works by multiplying the data signal with a pseudo-random noise sequence, resulting in a signal that appears as noise to unintended receivers. This technique is commonly used in Wi-Fi networks and GPS systems. By spreading the signal, DSSS enhances resistance to jamming and allows multiple users to share the same frequency band without significant interference. This makes it an effective choice for reliable communication in various applications.