Answer
If a solution is extraneous then it is a solution derived from the original equation that is NOT a solution for the original equation.
Work Step by Step
If a solution is extraneous then it is a solution derived from the original equation that is NOT a solution for the original equation.
For example, when solving absolute value equations you make two or more equations to solve.
Sometimes, not every answer to one of those will work with the original equation. Those solutions are extraneous.