The Substitution Method is a technique used to solve systems of equations, particularly in algebra. It involves solving one equation for a variable and then substituting that expression into the other equation. This process simplifies the system, allowing for easier calculation of the variable values. Once the values of the variables are found, they can be substituted back into the original equations to verify the solution. This method is especially useful when one equation is already solved for a variable or can be easily manipulated to do so, making it a straightforward approach for solving linear equations.