The Epidermal Growth Factor Receptor (EGFR) is a transmembrane protein that plays a crucial role in cell growth, proliferation, differentiation, and survival. As a member of the ErbB family of receptor tyrosine kinases, its activation by ligands like EGF leads to intracellular signaling cascades. Dysregulation or mutations in EGFR are frequently observed in various cancers, including non-small cell lung cancer, head and neck cancer, and colorectal cancer, making it a significant therapeutic target for targeted therapies.