What is the bill and what it means avalized bill of exchange

Industrial enterprises are increasingly faced with a situation where they are offered bills of exchange as payment for the delivered products. For many entrepreneurs, this method of payment is of great concern. It is much more reliable to immediately receive payment in cash than in return you will be given a bill. In order to minimize the possible risks of accepting bills as payment, companies require additional guarantees of timely transfer of funds. So suppliers try to protect themselves as much as possible. In this case, it is better to demand a bill of exchange issued by the Bank. In this article we will consider what "Aval" means, under what conditions and where it can be obtained?