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Best possible; the best or most favorable under the given circumstances or possibilities.
Für das Pflanzen von Tomaten sind sonnige und windgeschützte Standorte optimal.
Sunny and sheltered locations are optimal for planting tomatoes.
'Optimal' is an absolute adjective because it already means 'best possible.' Therefore, it cannot be compared. Forms like 'optimaler' or 'am optimalsten' are grammatically incorrect.
Die Bedingungen für das Experiment sind optimal.
The conditions for the experiment are optimal.
'Optimal' is very often used with the preposition 'für' (for) and the accusative to indicate what something is best suited for.
Dieses Wetter ist optimal für eine Wanderung in den Bergen.
This weather is optimal for a hike in the mountains.
Common and useful combinations are 'optimale Bedingungen' (optimal conditions), 'eine optimale Lösung' (an optimal solution), 'der optimale Zeitpunkt' (the optimal time), or 'optimal nutzen' (to use optimally/make optimal use of something).
Wir müssen den Platz in der kleinen Wohnung optimal nutzen.
We have to make optimal use of the space in the small apartment.
perfect
Perfekt praises a solution as exactly right or especially successful, often from a personal point of view. Optimal refers to the best or most favorable choice among the available options and under the given conditions. That is why optimal is especially suitable when making a comparison according to clear criteria.
Von den drei Lösungen ist diese bei unserem kleinen Budget optimal.
Of the three solutions, this one is optimal for our limited budget.
Diese Lösung ist perfekt für uns, weil sie alle unsere Wünsche erfüllt.
This solution is perfect for us because it fulfills all our wishes.
