What does LTV measure?

LTV is the predicted revenue that one customer will generate throughout their relationship with a company.
LTV is a quick indicator of a customer’s value relative to how much it costs to earn them.
LTV is a marketing metric that measures the percentage of website visitors or users who complete a desired action, such as making a purchase.
LTV is a metric that refers to the amount of money an advertiser pays for each click on their advertisement.

The correct answer is:

LTV is the predicted revenue that one customer will generate throughout their relationship with a company.