First off, to understand this question, one must understand what genetic engineering is.
Genetic engineering is a technique for transferring a single gene from one organism to another.
1 DNA is the blueprint for the individuality of an organism. The organism relies upon the information stored in its DNA for the management of every biochemical process. Scientists cut specific genes from DNA and build customized DNA using other genes. Genes are segments of DNA which have been associated with specific features or functions of an organism. Genetically engineered food, therefore, is food which has had it s genes altered by scientists in an attempt to better the food.