An antiferromagnet is a type of magnetic material where adjacent atomic spins align in opposite directions. This results in a net magnetic moment of zero, as the opposing spins cancel each other out. Antiferromagnetic behavior typically occurs at low temperatures, where thermal energy is insufficient to disrupt the ordered arrangement of spins. In contrast to ferromagnets, where spins align in the same direction, antiferromagnets exhibit unique properties that can be useful in various applications, including spintronics and magnetic storage. Understanding antiferromagnetism is essential for developing advanced materials and technologies in the field of condensed matter physics.