23andMe, Inc. is a publicly held personal genomics and biotechnology company based in Sunnyvale, California. It is best known for providing a direct-to-consumer genetic testing service in which customers provide a saliva sample that is laboratory analysed, using single nucleotide polymorphism genotyping, to generate reports relating to the customer's ancestry and genetic predispositions to health-related topics. The company's name is derived from the fact that there are 23 pairs of chromosomes in a wildtype human cell.