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Impact
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Impact printers are capable of printing "carbon" copies of documents using special NCR (no carbon required) papers. If you need more than one copy of a document (such as a receipt), you will need an Impact printer. Impact printers are significantly slower and significantly more noisy than thermal printers.
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Thermal
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Thermal receipt printers are capable of printing only on thermally treated (heat sensitive) paper. Thermal paper receipts are susceptible to the background going dark grey if the paper is exposed to heat or strong direct sunlight and will be easily marked if the paper surface is rubbed with, say, a fingernail. Thermal printers are significantly faster and significantly less noisy than impact printers.
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