What does one mean by exothermic and endothermic reactions? Give examples

Explanation

Chemical reactions that release energy in the form of heat, light, or sound are called exothermic reactions
Example : `C(g)+O_(2)(g)rarr CO_(2)+` Heat Energy
Reactions that absorb energy or require energy in order to proceed are called endothermic reactions
Example :
`N_(2)(g)+O_(2)(g) overset("Heat")(rarr) 2NO`.