The prefix "micro-" is derived from the Greek word "mikros," which means small or tiny. When attached to another word, it indicates something that is very small in size or scale. For example, a microphone is a device used for amplifying sound, while a micrometer measures extremely small distances. In biology, microorganisms are living things that are too small to be seen with the naked eye, such as bacteria and viruses. The prefix "micro" can also refer to computer technology, where it is often used in front of words like memory (megabyte) or storage capacity (gigabyte).