plasmids are used for recombinant DNA technology have recognition sequences for a number of restriction enzymes. This allows restriction enzyme to cut the plasmid at a specific sequence. Ligation enzymes can then be used to legate in new genomic sequences. Restriction enzymes have two properties useful in recombinant DNA technology such as 1) They cut DNA into fragments of a size 2) Many restriction enzymes make staggered cuts generating single-stranded sticky ends conducive to the formation of recombinant DNA Read more about it at https://bit.ly/2wdkYBO