Explain the term 'Rancidity' with one example.

(N/A) Rancidity:
The process of oxidation of fats and oils that can be easily noticed by the change in taste and smell is known as rancidity.
For example,the taste and smell of butter changes when kept for a long time.
Rancidity can be prevented by:
$1.$ Storing food in airtight containers.
$2.$ Storing food in refrigerators.
$3.$ Adding antioxidants.
$4.$ Storing food in an environment of nitrogen gas.