Restriction sites have a unique 4-8 nucleotide sequence that restriction enzymes recognize.
Restriction enzymes are enzymes that cut DNA at or near the restriction site.
Restriction enzymes:
A restriction enzyme is a bacterial protein that cleaves DNA sequences at sequence-specific places, resulting in DNA fragments having a known sequence at each end.
Certain laboratory processes, such as recombinant DNA technology and genetic engineering, require the use of restriction enzymes.