CSK (C-Src Tyrosine Kinase) is an important regulatory enzyme that controls the activity of Src family tyrosine kinases by phosphorylating and inhibiting them. These kinases play key roles in cell growth, differentiation, and survival signaling pathways. Dysregulation of CSK can lead to abnormal cell signaling, contributing to cancer and other diseases. Studying CSK’s regulatory functions helps us understand cell signaling control and offers potential targets for therapy in diseases involving tyrosine kinase imbalances.