A transgene is a gene that has been artificially created and imported into a host organism's genome. Other words that can be used as synonyms for transgene include foreign gene, exogenous gene, introduced gene, engineered gene, and genetically modified gene. These terms reflect the fact that transgenes are created through genetic engineering techniques, such as recombinant DNA technology or gene editing. Transgenes are often utilized in biotechnology, agriculture, and medicine to introduce new traits into organisms or create new therapeutic strategies for treating diseases. Despite their potential benefits, transgenes have elicited controversy over concerns about their safety and impact on ecosystems.