Question

what does mean by exothermic and endothermic reaction with example

Answer 1

the reactions in which heat is given out are called exothermic reactions.
the reactions in which heat is required to perform a chemical reaction are called endothermic reactions.
combination reactions are exothermic,while decomposition reactions are endothermic.

Answer 2

a reaction in which heat is evolved out and that increased the temperature of our surrounding is called exothermic reaction.
as
C+ O2---------> CO2
and in endothermic it is vice versa