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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' and 'optimal' both describe something very good. 'perfekt' can mean that something is error-free or fits very well. 'optimal' means that it is the best or most favorable solution under the given possibilities. That is why 'optimal' often sounds more factual, for example in planning, technology, health, or organization. Learners may confuse the words because both are very positive evaluations. If you want to express feelings or enthusiasm, 'perfekt' is often more natural. If you mean the best solution among several possibilities, 'optimal' fits better.
Für konzentriertes Lernen ist ein ruhiger Platz am Morgen optimal.
A quiet place in the morning is optimal for focused learning.
Deine Präsentation war perfekt, alle haben sie gut verstanden.
Your presentation was perfect; everyone understood it well.