Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Generate an example of how we can measure the effectiveness of an online advertisement.

### Response:
We can measure the effectiveness of an online advertisement by looking at the number of conversions per impression (CPI), click-through rate (CTR), cost-per-click (CPC), and the total number of impressions it received. Additionally, we can measure the return on investment (ROI) achieved through the advertisement.