An exon is any nucleotide sequence encoded by a gene that remains present within the final mature RNA product of that gene after introns have been removed by RNA splicing. The term exon refers to both the DNA sequence within a gene and to the corresponding sequence in RNA transcripts. In RNA splicing, introns are removed and exons are covalently joined to one another as part of generating the mature messenger RNA or noncoding RNA product of a gene.

Read more about Exon:  History, Experimental Approaches That Utilize Exons

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Experimental Approaches That Utilize Exons
... Exon trapping or 'gene trapping' is a molecular biology technique that exploits the existence of the intron-exon splicing to find new genes ... The first exon of a 'trapped' gene splices into the exon that is contained in the insertional DNA ... This new exon contains the ORF for a reporter gene that can now be expressed using the enhancers that control the target gene ...