Conduction is the transfer of energy in the form of heat or electricity directly from one particle to another through physical contact. It occurs when particles in a material vibrate or collide, passing energy from the hotter region to the cooler region without any movement of the material itself. This process happens mainly in solids, where particles are tightly packed, but can also occur in liquids and gases to a lesser extent. In summary, conduction is energy transfer via direct contact between atoms or molecules within an object or between objects in contact.