Elle wants to understand how much, on average, her ads cost her per click. Which metric would best help her understand this?

aCPC (average cost per click) is the best metric to understand how much, on average, ads cost per click. It is calculated by dividing the total cost of clicks by the total number of clicks. CPC (cost per click) is a bidding strategy where advertisers pay for each click on their ad, but it doesn't represent the average cost across all clicks, which can fluctuate. Impressions measure how many times an ad was displayed, not its cost per click. Spend is the total amount of money spent, but it doesn't break down the cost per individual click.