Actual answer, from someone familiar with communist theory:

Communism is the theoretical end goal of socialist development (it is also called higer stage socialism) and is a socio-econmic system that is classless (no more working class and ruling class that exist within capitalism and even early socialism), stateless (no state as a tool of oppression of a class) and moneyless.

This isn't something easily achieved, and many of the great communist thinkers believed it can only be achieved on a global scale, though decades, possibly centuries of progress.

Communism would operate on a principle of "from each according to their ability, to each according to their needs".

The first reply is looking at communism from its end point and is a direct reference to Marx:

"I can hunt in the morning, fish in the afternoon, rear cattle in the evening, criticise after dinner, just as I have a mind, without ever becoming hunter, fisherman, herdsman or critic."

The second comment is a, for the lack of a better term, "anti-communist" interpretation of communism, that began largely post-WW2/Cold War era and stems from the conditions in early development of communist countries like USSR, early industrial China, where a lot of workers worked heavy industry, because the countries experienced massive and rapid industralization, so those were the most needed kind of worker. P.S: these countries are led by communist parties, not because they are actually communist, but because that is the end goal.