Variable entered mapping (VEM) is used to reduce the size of K-maps with many variables. In VEM, one variable is chosen as the map entered variable and included in the K-map along with zeros, ones, and don't cares. This allows representing functions with more variables using a smaller K-map. Two examples are provided to demonstrate VEM, showing the truth tables and K-maps with a variable entered, and verifying the minimized functions match the original functions.