The prefix "zetta" is a unit of measurement in the International System of Units (SI) that represents a factor of 10^21, or 1,000,000,000,000,000,000,000. It is commonly used in fields such as computing and data storage to quantify large amounts of information, such as zettabytes, which equal one sextillion bytes. Zetta is part of a series of metric prefixes that help express large numbers in a more manageable way. Other prefixes in this series include tera (10^12), peta (10^15), and exa (10^18). These prefixes are essential for scientific communication and data analysis.