The CRISPR-Cas system has revolutionized genome editing by enabling precise, efficient modifications in a wide range of organisms and cell types. This system uses RNA-guided nucleases, such as Cas9, to target specific DNA sequences, allowing for targeted gene editing, regulation, and labeling. The system's ability to induce targeted mutations through non-homologous end-joining (NHEJ) or homology-directed repair (HDR) has made it a powerful tool for both research and therapeutic applications. However, off-target effects remain a challenge, and strategies such as using truncated guide RNAs (tru-gRNAs) or paired nickases have been developed to improve specificity and reduce unintended mutations. The CRISPR-Cas system has also been adapted for non-nuclease applications, such as regulating gene expression and labeling genomic loci. Despite its potential, challenges remain in fully defining the system's specificity and optimizing its use in various organisms and cell types. Ongoing research aims to enhance the system's precision, efficiency, and applicability in both research and clinical settings.The CRISPR-Cas system has revolutionized genome editing by enabling precise, efficient modifications in a wide range of organisms and cell types. This system uses RNA-guided nucleases, such as Cas9, to target specific DNA sequences, allowing for targeted gene editing, regulation, and labeling. The system's ability to induce targeted mutations through non-homologous end-joining (NHEJ) or homology-directed repair (HDR) has made it a powerful tool for both research and therapeutic applications. However, off-target effects remain a challenge, and strategies such as using truncated guide RNAs (tru-gRNAs) or paired nickases have been developed to improve specificity and reduce unintended mutations. The CRISPR-Cas system has also been adapted for non-nuclease applications, such as regulating gene expression and labeling genomic loci. Despite its potential, challenges remain in fully defining the system's specificity and optimizing its use in various organisms and cell types. Ongoing research aims to enhance the system's precision, efficiency, and applicability in both research and clinical settings.