I've been told that there are some differences between a "pie" and a "tart". What's the difference, and when do I call it a pie, and when do I call it a tart?
Sorry for my English!
Generally speaking, a pie refers to a pastry covered with a lid, like a typical apple pie. A tart is open topped, like a quiche, or a French tartes aux pommes.
However, there are exceptions to this: many pies will be open topped too. Usually this is a matter of depth: the deeper it is, the more likely it is to be called a pie rather than a tart.
Regional variations also apply.
It's the shape. A tart is baked in a shallow dish with straight sides; a pie dish is deeper, and has sloping sides. At least, that's the way it is in the US.