Protein-protein interactions refer to the relationships and communication that occur between two or more proteins. These interactions are critical for many biological processes, including cell signaling, gene expression, and enzyme function. Studying protein-protein interactions requires specialized skills, including the ability to isolate and purify proteins, use techniques such as surface plasmon resonance and yeast two-hybrid assays to detect interactions, and analyze data using bioinformatics tools. Understanding protein-protein interactions can provide insights into disease mechanisms and lead to the development of new therapies.