An X implies that a signal value is unknown (cannot be positively determined) and can be either one or zero. Unknown signal states are common while debugging simulation results and typically signify uninitialized signals or signals driven by more than one driver. In post layout simulations, they can also indicate a timing violation.
On the board / In reality there is nothing implies to 'X' but what it implies is that the result is not known/ cannot be predicted. The situation which we do not like to be in
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