Final answer:
A blackbody is an object that absorbs all radiated energy that strikes it and also emits energy across all wavelengths of the electromagnetic spectrum.
Step-by-step explanation:
A blackbody is an object that absorbs all radiated energy that strikes it and also emits energy across all wavelengths of the electromagnetic spectrum. It does not reflect or scatter any radiation but instead absorbs all of the electromagnetic energy that falls onto it. Blackbodies are often used as models to study and understand the behavior of radiation and heat transfer.