Hydrogen-deuterium exchange mass spectrometry (HDX-MS) is an invaluable analytical tool in structural biology and biochemistry, significantly enhancing our understanding of protein dynamics and interactions. This technique utilizes heavy water (D2O) to label the protein molecules and employs a mass spectrometer to measure the extent of deuterium incorporation in various protein regions. The extent of deuterium incorporation provides valuable insights into protein structure, conformational dynamics, and interactions, making it a powerful tool for identifying the binding sites, epitopes, and comparative analyses. HDX-MS is a powerful research tool and a catalyst for innovative drug discoveries and advancements in various scientific fields.