Micro is a shortened phrase used when refering to the micromanagement of a players units in an RTS game.

This means controlling an individual unit, rather than allowing the AI to take over and control the unit, or selecting a group and getting them to attack at once. Microing may also mean using more often advanced control methods on a unit.

Microing should increase unit effectiveness and reduce losses.

Micromanagement will take up a alot of your concentration power and time. As a general rule you should be spending a considerably longer time controlling your units in battles than managing your base.

Over microing can also be an issue, re-issueing orders that have already been sent may cause the unit to miss/stop firing for a brief period of time.