Biochip is a small device that integrates biological materials with microelectronics. There are several synonyms that are commonly used to refer to this technology including microarray, bio-circuit, microfluidic chip, bio-sensor, and lab-on-a-chip. Microarray is used to describe chips that contain DNA and RNA probes that enable biological analysis of genes, proteins, and pathogens. Bio-circuits are miniaturized electronic circuits that enable biological signal processing. Microfluidic chip refers to a biochip that manipulates fluids on a very small scale. Bio-sensors are biochips that detect biological entities such as antigens and antibodies. Lab-on-a-chip technology is used to describe biochips that test biological samples in a miniaturized environment. Overall, biochip technology is rapidly advancing and its many synonyms reflect the breadth of its applications in the biological and medical sciences.