Cost Per Acquisition, often abbreviated as CPA, is a key performance indicator and a metric that is widely used in the fields of digital marketing and advertising to measure the aggregate cost to acquire one paying customer on a campaign or channel level. It essentially tells a company how much it needs to spend on its marketing efforts to convince a potential customer to purchase a product or service. The CPA is calculated by dividing the total cost of a marketing campaign by the number of conversions, which can be sales, sign-ups, or any other action that the company has defined as valuable. This figure provides a clear financial indicator of the return on investment for different marketing initiatives, allowing businesses to allocate their budgets more effectively. A lower CPA indicates a more cost-effective campaign, while a higher CPA suggests that the marketing tactics may need to be adjusted to improve efficiency. Marketers and advertisers closely monitor CPA to optimize their advertising spend, improve their targeting strategies, and ultimately drive better results for their business.