영어 Hint of the Day (비지너스) #11: "At the end of the day" is a phrase that is easy to understand and easy to use. BUT...

"At the end of the day" is a phrase that is easy to understand, and easy to use.  But...

"At the end of the day" is usually used when drawing a conclusion among a number of factors.  For example, you may be a soccer (football) expert, and believe that Barcelona FC is the world's best after evaluating the strikers, midfielders and the goaltender.  You can say:

(o) At the end of the day, Barcelona FC is the best soccer club in the world.

Notes:
a.  The phrase is most commonly found at the very beginning of a sentence, and not at the end.
b.  This phrase is NOT usually used when writing.  It would not be considered to be appropriate for writing academic papers or essays.  It would not be considered to be appropriate for use in professional, written business reports.
c.  This phrase is frequently used in speaking by analysts of every type.  In fact, it has become so popular in the past number of years that many are becoming tired of it.  They believe that it is overused.  The Lost Seoul doesn't necessarily think so:  the phrase is convenient for Korean native speakers that want to draw a conclusion (or make a "key point") when trying to persuade others.  In addition, all native English speakers will easily understand what this means.  This is of course the most important goal: to make others understand what you are saying.

At the end of the day, use the phrase "At the end of the day," but do not use it excessively.