Living things are largely made of proteins. A simplified definition of a gene is that it is a segment of DNA that codes for the synthesis of one or more particular proteins. A more complete definition is given by Wikipedia:
A gene is a molecular unit of heredity of a living organism. It is a name given to some stretches of DNA and RNA that code for a polypeptide or for an RNA chain that has a function in the organism. Living beings depend on genes, as they specify all proteins and functional RNA chains. Genes hold the information to build and maintain an organism’s cells and pass genetic traits to offspring, although some organelles (e.g. mitochondria) are self-replicating and are not coded for by the organism’s DNA. All organisms have many genes corresponding to various biological traits, some of which are immediately visible, such as eye color or number…
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