Protein-protein interaction (PPI) refers to the specific ways in which two or more proteins bind together and communicate within a cell. These interactions are crucial for various biological processes, including cell signaling, immune responses, and metabolism. By forming complexes, proteins can work together to perform functions that are essential for maintaining life. Understanding PPIs is important for fields like biochemistry and drug development. Disruptions in these interactions can lead to diseases, including cancer and neurodegenerative disorders. Researchers study PPIs to identify potential therapeutic targets and to design drugs that can modulate these interactions for better health outcomes.