India has always remained in the forefront from the ancient time in imagining about the currency of variety. It is believed that paper currency came into existence in eighteenth or nineteenth century. Now a days, paper currency is used widely in trade and industry.
As the metal currency had more value than its original value, people used to collect it which resulted in the shortage of currency. That is how, paper currency came into existence. The paper currency is light in weight. It is easy to carry it everywhere.
But some evil people make replica of paper currency. The government has put some secret places in the paper currency in order to prevent its copying. It includes water mark, security thread, embossed printing, invisible mark etc. Due to this, criminals can not make copy of it. Thus paper currency is more popular in financial transactions now a days.