Protein-protein interactions refer to the physical contacts established between two or more proteins in a cell that play a critical role in various biological processes, such as signal transduction, enzyme catalysis, and gene regulation. Understanding these interactions is essential for elucidating the mechanisms underlying cellular function and disease. Researchers use various experimental techniques, such as co-immunoprecipitation, yeast two-hybrid assays, and protein complementation assays, to study protein-protein interactions and identify potential drug targets. Additionally, computational methods, such as molecular docking and protein-protein interaction prediction algorithms, are used to predict and analyze these interactions. Overall, investigating protein-protein interactions is crucial for advancing our knowledge of cellular processes and developing new therapeutic strategies.