The term skepticism is widely used. The attitude of questioning anything can be called skepticism. The term skepticism is commonly used to mean doubting a popular concept. Skepticism is when you find a sign of something and do not accept it without a sentence, but question that sign. Those who believe in or practice skepticism are called skeptics. The word skepticism , the English word for skepticism, comes from classical philosophy . There were some philosophers in ancient Greece who "did not declare anything certain but expressed their own views on everything". This line of philosophers was then called Skeptikoi . Therefore , Skeptikoi is a characteristic of the philosophers of the philosophical genre that has to be termed as skepticism.