Protein targeting is a field of research that focuses on the mechanisms by which proteins are directed to specific locations within a cell or organism. This process is crucial for the proper functioning of cells and organisms, as proteins must be localized to the correct subcellular compartments in order to carry out their biological functions effectively. Protein targeting mechanisms include signal sequences, protein-protein interactions, and organelle-specific targeting signals. Understanding how proteins are targeted to their correct locations is essential for advancing our knowledge of cell biology and developing targeted therapies for diseases.