Differential thermal analysis (DTA) is a thermal analysis technique that monitors the temperature difference between a sample and an inert reference material as both are subjected to a controlled temperature program. It detects endothermic or exothermic physical or chemical changes in the sample that cause temperature differences compared to the reference. A DTA instrument consists of sample and reference holders connected to thermocouples, a furnace, temperature programmer, and recording system to plot the differential temperature curve against time or temperature. DTA provides both qualitative and quantitative information about materials and is widely used in industries like pharmaceuticals, polymers, minerals, and cement.