# Don't Care Condition **A particular [[Boolean function]] condition, input or output, which is unspecified.** Don't care conditions can be ignored to simplify truth tables and [[Karnaugh Map|K-maps]]. They are denoted with X's in the their cells. Typically an output condition is *unspecified* because its input condition *never occurs*. > [!Input condition example]+ > An example of an input condition that never occurs are the binary coded decimal input combinations $1010$ to $1111$. > > The corresponding K-map for the circuit thus would contain don't care conditions as follows: > > ![[Don'tCareConditionKMapExample.svg|500]]