An ideal solution is one that is optimal for the given problem and meets all the desired criteria. It is usually the most efficient and cost-effective solution. A non-ideal solution is one that does not meet all the desired criteria, or is not the most efficient or cost-effective. It may still be a viable solution, but it is not optimal.

An ideal solution is typically the result of careful consideration of the problem and all its variables, and the development of a solution that meets all the desired criteria. It is usually the most efficient and cost-effective solution and is often the one that is chosen.

A non-ideal solution is one that does not meet all the desired criteria, or is not the most efficient or cost-effective. It may still be a viable solution, but it is not optimal. It is often a result of a rushed decision, or of a lack of understanding of the problem, or of a lack of resources. It may also be the result of a compromise between competing interests or goals.

In summary, an ideal solution is one that is optimal for the given problem and meets all the desired criteria, while a non-ideal solution is one that does not meet all the desired criteria, or is not the most efficient or cost-effective.