Protein interactions refer to the ways in which proteins bind and communicate with each other to perform various biological functions. These interactions can be essential for processes such as enzyme activity, signal transduction, and cellular structure. Proteins can interact through various mechanisms, including hydrogen bonds, ionic interactions, and hydrophobic effects. Understanding protein interactions is crucial for fields like biochemistry and molecular biology, as they play a significant role in cellular processes and disease mechanisms. Researchers study these interactions to develop new therapies and drugs, as targeting specific protein interactions can help treat conditions like cancer and neurodegenerative diseases.