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Click-through rate
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<p>Click-through rate (CTR) is the ratio of <a href="/facts/Mouse_click/0YdM6AoB">clicks</a> on a specific <a href="/facts/Hyperlink/LqNsa84e">link</a> to the number of times a page, email, or advertisement is shown. It is commonly used to measure the success of an <a href="/facts/Online_advertising/Ncsv0GRz">online advertising</a> campaign for a particular website, as well as the effectiveness of <a href="/facts/Email_marketing/7twn8FMg">email campaigns</a>. </p><p>Click-through rates for ad campaigns vary tremendously. The first online <a href="/facts/Display_ad/1wscYn31">display ad</a>, shown for <a href="/facts/AT%2526T/y3Lo9uhk">AT&T</a> on the website <a href="/facts/Wired_(website)/RQb6gcyf">HotWired</a> in 1994, had a 44% click-through rate. With time, the overall rate of user's clicks on webpage <a href="/facts/Banner_ad/lmCm7yIW">banner ads</a> has decreased. </p>