Ultimately or after everything else has been considered.
Using the reference
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At the end of the day means ultimately, once all the details and side issues have been taken into account.
The phrase functions as a summary marker. It tells the listener that the speaker is about to name the main conclusion, practical reality, or point that survives after discussion.
People use this expression in meetings, interviews, politics, sports commentary, and ordinary speech. It is common because it sounds conversational and definite, though it can also feel tired or filler-heavy.
The literal wording is older than the modern cliché. Its familiar present-day use as a summary formula became especially common in management talk, interviews, and broadcast commentary.
Because the phrase is heavily overused, it can sound empty if it does not lead to a real conclusion.