When a person receives a bill of exchange he may decide to retain the bill till the date of maturity. But in order to ensure safety, he may send it to the bank with instructions that the bill should be retained till maturity and should be realised in that date. This does not mean discounting because the bank will not credit the client until the amount is actually realised. If the bill is sent to the bank with such instructions it is known as ‘Bill sent for collections.