POS is related to sale. POS (point of sale) When any person sale the goods to the other person then bill is properly maintained to give to the purchased party is called point of sale. It is very helpful to calculate the sale. POS is very useful for retailers and shopkeepers. By the help of POS small invoices can be printed quickly.A POS is very helpful to manages the selling process by a salesperson. Point Of Sale (POS) is very helpful for the small business.