
erleuchten
to illuminate
To make something bright with light or cause it to shine.
Ein großer Kronleuchter erleuchtete den ganzen Saal.
A large chandelier illuminated the entire hall.
to illuminate / enlighten
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to illuminate
To make something bright with light or cause it to shine.
Ein großer Kronleuchter erleuchtete den ganzen Saal.
A large chandelier illuminated the entire hall.

to enlighten
To give someone a sudden insight or deep understanding.
Seine Erklärung hat mich endlich erleuchtet und ich verstand das Problem.
His explanation finally enlightened me, and I understood the problem.

to enlighten
In a religious or spiritual sense, to reach or bring about a state of deep spiritual insight and inner peace.
Der Guru versprach seinen Anhängern, sie zu erleuchten.
The guru promised his followers that he would enlighten them.
'Erleuchten' (to illuminate / enlighten) is an inseparable verb. The prefix 'er-' always stays attached to the verb stem and is not placed at the end of the sentence. The past participle is formed without 'ge-': 'erleuchtet' (illuminated/enlightened).
Die Blitze erleuchteten den Nachthimmel.
The lightning illuminated the night sky.
The verb is made up of the prefix 'er-' and the verb 'leuchten' (to shine). The prefix 'er-' often expresses the achievement of a result. So 'erleuchten' means to bring something or someone into a state of shining, whether literally with light or figuratively with knowledge.
Eine einzelne Kerze erleuchtete das kleine Zimmer.
A single candle illuminated the small room.
You can recognize the literal meaning by the fact that the object is a physical place or thing that is being made bright. In the figurative meanings, the object is usually a person who gains insight.
Die Scheinwerfer erleuchteten die Bühne.
The spotlights illuminated the stage.
The figurative meaning of giving someone insight is often used in an elevated or slightly ironic style. It often sounds somewhat more formal or dramatic.
Könntest du mich bitte erleuchten, was hier vor sich geht?
Could you please enlighten me as to what is going on here?
to illuminate / examine
Beleuchten usually means directing light at a specific target so that it becomes visible. Erleuchten places greater emphasis on something becoming bright overall or beginning to glow. Use beleuchten for shining light directly on something and erleuchten for the resulting brightness.

Viele Lampen erleuchten den ganzen Saal.
Many lamps illuminate the entire hall.
Ein Scheinwerfer beleuchtet gezielt die Statue im Saal.
A spotlight specifically illuminates the statue in the hall.