A biochip is a small device that directly connects an organism to an engineering system. To do so, biochips often include tiny built-in sensors that analyze biochemical targets in organisms such as cells, blood, or skin. Biochips utilize a wide array of technological advances such as microfluidics, microarrays, optics, or electronics. Current applications of biochips are in disease diagnostics, security, and gene sequencing, with many new applications emerging.