optimal solution
Used in technical, mathematical, or problem-solving contexts to refer to the best possible solution under given constraints.
Linear programming is used to find the optimal solution to this problem.
After much discussion, the team arrived at the optimal solution for the project.
解 is a general term for 'solution' or 'answer', whereas 最適解 emphasizes that it is the best possible solution.
Compound of 最適 (optimal) + 解 (solution).