Repetitive DNA

In the study of DNA sequences, one can distinguish two main types of repeated sequence:Tandem repeats:Satellite DNA,Minisatellite,Microsatellite;Interspersed repeats:SINEs (Short INterspersed Elements),LINEs (Long INterspersed Elements).The majority of LINEs are LINE-1 and the majority of SINEs are ALUs.In prokaryotes, CRISPR are arrays of alternating repeats and spacers.
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DNA sequences that are repeated in the genome.

Non-coding DNA which consists of nucleotide sequences repeatedly occurring in chromosomal DNA. They do not normally have any function but those capping the chromosomes prevent the loss of genetic information after each replication (as this would cause a 3' overhang). In human genome, at least 20% of the DNA consists of repetitive sequences.