Sales Margin is the difference between the revenue you earn from a sale and the cost of making that sale.
For example, if you sell a product for $100 and it costs you $50 to make, your sales margin is 50%.
Sales margin is an important metric because it shows how much profit your company is making on each sale. If your sales margin is high, you're making a lot of money on each sale. If your sales margin is low, you're making very little money on each sale.
Sales margin is also important because it helps you determine your break-even point. If you know how much it costs you to make a sale, and you know what your sales margin is, you can figure out how many sales you need to make in order to break even.