Some people use cost interchangeably with expense. However, we use the term cost to mean the amount spent to purchase an item, a service, etc. Some costs are not expenses (cost of land), some costs will become expenses (cost of a new delivery van), and some costs become expenses immediately (airing a television advertisement). Examples of Costs ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.