Log in Definition 1 of 2Pro Tip 1/3Action Required Refers to an action you must take to move forward on a site or app. You need to log in to see the prices. Pro Tip 2/3Privacy Protection Used to protect your information from others when using public or shared devices. Always log in to secure your personal details. Pro Tip 3/3Verification Step Acts as a security checkpoint to verify your identity online. Log in to confirm it's really you.