The National Instruments Electronics Workbench Group is responsible for innovating the electronic circuit design software NI Multisim and NI Ultiboard, which was previously a Canada-based company that first produced MultiSIM, and integrated ULTIboard with it. wikipedia.org

Digital electronics, or digital (electronic) circuits, represent signals by discrete bands of analog levels, rather than by a continuous range. All levels within a band represent the same signal state. wikipedia.org

Analogue electronics (or analog in American English) are electronic systems with a continuously variable signal, in contrast to digital electronics where signals usually take only two different levels. wikipedia.org