An establishment created by the government for the common good. While some subjects offered at public schools are frivolous, the majority of classes teach skills that can be applied in higher learning environments or real-life settings. Often regarded by ungrateful youths as a punishment or cruel confinement.
It is neither of these, but rather a luxury that not all countries afford their citizens. Public schools give children the opportunity of free learning. Those who can be bothered to pass their classes can earn a diploma so that they may go on to college where they can get a degree that will prevent the necessity of a career in waste disposal, fast food, or retail.
Hooray, I'm so glad that school is free! Now I can make something of my life instead of suckling the government's teat by living off of welfare because I didn't feel like going to class! I'm going to be a rocket scientist, while those who didn't apply themselves will spend the rest of their lives in abject poverty, bouncing from drug addiction to unplanned children to prostitution!