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Security question
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<p>A security question is a form of <a href="/facts/Shared_secret/ATRz7LXy">shared secret</a> used as an <a href="/facts/Authenticator/LouBFCYj">authenticator</a>. It is commonly used by <a href="/facts/Bank/XDA9aGge">banks</a>, <a href="/facts/Cable_companies/SJoPYcS2">cable companies</a> and <a href="/facts/Wireless_provider/6Tt5J4TF">wireless providers</a> as an extra <a href="/facts/Security/B4uxkyxh">security</a> layer. </p>