What is spot delivery contract and forward delivery contract?

A spot delivery contract really isn't much of a contract. You're a baker who needs sugar--you buy futures contracts but you've been hit with a huge order for cookies and you don't have enough sugar on hand to deal with the problem. Normally you'll have a line of credit established with a sugar company for just such occurrences. To make a spot contract, you call the sugar company and ask them to bring you a truckload of sugar. It shows up, you get the bill at the end of the month, all is well. That's a spot contract.

A forward delivery contract is for the sugar farmer. You have 500 acres of sugar beets. You have no idea of the exact tonnage of beets you are going to harvest or the exact date the harvest will be. To help manage your risk, you make a contract with a sugar refinery to sell them your whole crop when it is harvested for a specified price per ton.