In cybersecurity and blockchain contexts, a 'micro' refers to a very small, rapid transaction involving minimal amounts of digital tokens or assets. These micro transactions are often executed automatically and can be used for legitimate purposes, such as micropayments, or maliciously to exploit vulnerabilities in smart contracts, especially those related to precision errors or rounding issues in code. Attackers may use a series of micro transactions to accumulate significant gains or disrupt systems. Understanding micro transactions is important for developers and users to ensure robust security and prevent exploitation.