@incubusman8,
"How elementary can you get?" That was my reaction upon seeing the title of this discussion. Surely, I thought, nearly everyone has a pretty clear idea of what a democracy is and whether it can actually exist.
Now, after looking through these discussions, I still think the questions are elementary but I'm not at all sure that we commonly know the answers.
This discussion may have aimed to go beyond the simple scope indicated by its title. It includes distinctions between "social concept" and "political definition" and qualitative opinions about "apathy" and hypocrites". I tried to understand these subtleties. My failure to do so may well be due to my own ignorance, but in any event it led to these simplified answers.
A democracy is a system of government in which the people rule. Each decision that needs to be made is made by the people
in toto. It is also known as a "direct democracy" or a "pure democracy" The United States and other governments commonly called "democracies" in reality are republics. A republic is a system of government in which the people choose representatives who, in turn, make policy decisions in their behalf.
Democracy or, if you wish, "pure" democracy is possible. It existed in ancient Greece cities. But history has shown it is tenable only in small groups of people. It doesn't work in large groups and, as the Founding Fathers warned, it has and can produce much harm. Those men would be troubled (as I am) by the elements of "pure democracy" creeping into the operation of our republic these days - such as the provision in many states for ballot initiatives or referendums allowing people to make policy decisions directly by vote.
Maybe the above is kindergarten stuff to you. If so, I apologize.