The term "exa" is a prefix in the International System of Units (SI) that denotes a factor of 10^18 or one quintillion. It is commonly used in scientific and technical contexts to express large quantities, such as data storage or computing power. For example, one exabyte (EB) equals one quintillion bytes. In computing, the use of "exa" has become increasingly relevant as data generation and storage needs grow. Technologies like cloud computing and big data analytics often deal with exabytes of information, highlighting the importance of this prefix in modern data management and processing.