Scotch is the name for the whisky made in Scotland (so-spelled there, rather than "whiskey"). Whisky has been produced in Scotland for a long time, sometimes illegally.
Scotland is divided into a number of regions that produce whiskies with different regional characteristics: /Highland?, /Lowland?, /Speyside?, /Islay?, and /Campbeltown?. These characteristics are described by words like smoky, peaty, seaweedy, etc.