Which of the following describes chemiluminescence?

Chemiluminescence is defined as the emission of light as a result of a chemical reaction. This phenomenon occurs when certain chemicals undergo a reaction which releases energy in the form of light. It does not require an external light source such as heat or ultraviolet light, nor is it triggered by physical pressure. This distinguishes chemiluminescence from other processes that produce light, such as thermal radiation, which relies on heat, or fluorescence, which is dependent on energy absorption from external radiation. The specific nature of chemiluminescence finds applications in various fields, including bioluminescence in organisms and certain chemical assays that utilize light-emitting reactions for detection and measurement purposes.