Scientists can now rewrite the genetic instructions of living organisms. Genetic engineering is the deliberate modification of an organism’s DNA using laboratory techniques. The goal may be to study gene function, produce useful proteins, improve crops, or develop therapies.

Tools include restriction enzymes, DNA ligases, CRISPR systems, and synthetic DNA. Genes can be inserted, deleted, or edited with nucleotide precision. Recombinant bacteria produce insulin; engineered plants resist pests; experimental animals model human disease.

Regulatory frameworks govern release of genetically engineered organisms into the environment and the clinic. Public discussion continues around safety, ethics, and labeling. The technology has transformed research and industry while raising important societal questions about its applications.

• Deliberate alteration of genetic material
• Uses molecular tools such as CRISPR
• Applied in medicine, agriculture, and research
• Subject to regulatory and ethical oversight