What are exothermic and endothermic reactions?

Exothermic Reaction: 
The reactions in which heat is released along with the formation of products are called Exothermic reactions.
Ex: Burning of natural gas 
Process of respiration.

Endothermic Reaction:
The reactions in which energy is absorbed are called Endothermic Reactions. 
Ex:  In a decomposition reaction, Lead nitrate absorbs heat to decompose into Lead Oxide, Nitrogen Dioxide and Oxygen. 

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