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How does perfective aspect differ from imperfective aspect in Modern Greek verbs?

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Thematic map of Eurasia showing the approximate geographic distribution of Indo-European language families, each represented by a different color. Areas include Celtic in western Europe, Germanic in northern and central Europe, Romance in southwestern Europe, Slavic in eastern Europe and Russia, and Indo-Iranian languages in South Asia. Non-Indo-European language regions and areas of common bilingualism are also indicated. — Greek language Approximate locations of Indo-European languages in contemporary Eurasia.

In Modern Greek, the distinction between perfective and imperfective aspect is a fundamental feature of the verb system, determining how an action is perceived in terms of its duration and completion.1

Perfective Aspect: This aspect is used to describe an action as a completed, momentary, or single event. Formally, it is often indicated by the presence of a specific marker (-s- in the active voice and -th- in the passive voice) attached to the verb stem. For example, ghrápse translates to "write down!" as a specific, completed task.1
Imperfective Aspect: In the absence of the perfective marker, the verb signifies an action that is viewed as incomplete, continuous, or repeated. For instance, the imperfective imperative ghráphe can mean "start writing!" or "write regularly!".1

This aspectual difference can also change the nuance of a verb, sometimes requiring different lexical translations in English, such as the difference between ákuye ("he was listening") and ákuse ("he heard").1