In the Greek language, delta is the fourth letter of the alphabet. In mathematical calculations, it means “difference” or “change.” Anyone who would like to create additional income from the financial markets using algorithmic trading should develop a solid understanding of delta. In options trading, delta (also known as one of “The Greeks”) refers to the relationship between an underlying asset’s share price and an option’s share value. In the trading community, delta measures risk and price changes in options trading. The delta of an option measures the risk versus the reward of a potential trade. Understanding delta can be critical for novices learning to create algorithms to trade options, as it helps determine the best price.