High technology, also known as advanced technology or exotechnology, is technology that is at the cutting edge: the highest form of technology available. It can be defined as either the most complex or the newest technology on the market. The opposite of high tech is low technology, referring to simple, often traditional or mechanical technology; for example, a slide rule is a low-tech calculating device. When high tech becomes old, it becomes low tech, for example vacuum tube electronics. Further, high tech is related to the concept of mid-tech, that is a balance between the two opposite extreme qualities of low-tech and high-tech. Mid-tech could be understood as an inclusive middle that combines the efficiency and versatility of digital/automated technology with low-tech's potential for autonomy and resilience.