Customs are widely accepted ways of doing something which are not opposed to rules of natural justice, equity and good conscience. These ways have been existing as a practice since a long time and in a continuous manner. Law based on customs is known as customary law.
Customary law need not always be in writing because the people are well aware on how things are usually done based on their regular practice. Many laws originate from customs and at times the widely accepted customs are legislated and we have enacted laws based on the customs.
Source of law means the origin of law and at times we find customs are the source from which many laws have come into existence in the society. They do have a binding effect on the people and play a major role in one’s life.