You’ll see 3 things in general: Genotyping: this is what 23andMe does. Here they’re looking at a few million locations on your genome to see what specific lett

You’ll see 3 things in general: Genotyping: this is what 23andMe does. Here they’re looking at a few million locations on your genome to see what specific letter you have. These are the locations which are most typically different in humans Whole Exome Sequenckng (WES): full sequencing of your Exome. this is an oversimplification but the Exome has historically been viewed as where the “useful” DNA Whole Genome Sequencing (WGS): what the name implies. Can be quite useful in cancer and rare disease research, and were increasingly realizing how much of an oversimplification my explanation of WES is Almost all commercial “sequencing” that you see advertised is genotyping. And in the real sequencing world WES dominates WGS. In both cases it is due to cost. There are also a ton of options on all of these, such as how many SNPs are on the SNP chip in the genotyping case, or depth of coverage for WES/WGS