What is an exothermic reaction?

Related questions

• Why is burning wood exothermic? I thought the wood is taking in heat to burn, therefore...
• How can an exothermic reaction be identified?
• Why is freezing an exothermic process?
• Why is respiration an exothermic process?
• Question #a5319
• What are some examples of exothermic reactions?
• What are exothermic reactions?
• What are some common mistakes students make with exothermic reactions?
• How does an exothermic reaction change the entropy of the surroundings?
• How do exothermic reactions occur?