The nozzle (or extruder) is the part of a 3D printer which deposits the molten plastic filament onto the 3D printer bed. The extruder can reach 200°-300°C, depending on the filament used, but typically stays around 215°C for regular prints.
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=== Heatbed ===
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The heatbed is a 9.83" x 8.3" x 8.3" plate where the filament will be "printed" on. The bed heats up to around 60°C. Heated beds typically prevent the plastic from warping by keeping it warm. Warping is a common issue that happens on 3D printers, where the plastic of the print cools at an uneven rate, leaving the print wavy and not the way you intentioned.