CRISPR-Cas design tools are computer software platforms and bioinformatics tools used to facilitate the design of guide RNAs for use with the CRISPR/Cas gene editing system. Wikipedia

CRISPR gene editing is a genetic engineering technique in molecular biology by which the genomes of living organisms may be modified. Wikipedia

A genetic engineering technique.CRISPR are termed as SDN since they target specific part of genome, there are 3 different categories of SDN. SDN1 makes random mutations at target site to repair the damaged host DNA without involving any foreign DNA. SDN2 uses small non coding homologous repair DNA to achieve specific nucleotide sequence to repair the host DNA by HDR which is a natural nucleic acid repair system. SDN3 uses a large stretch of protein coding donor DNA which is targeted for insertion through HDR at a predefined genomic locus. Wikipedia Disambiguation