Authentication & Authorization: OAuth Authentication vs AuthorizationLearn the difference between authentication and authorization and some best practices in developing a login system.Creating Google Sign in Investigate OAuth and build third-party sign-in into your web applications using Google's authentication services.Local Permission SystemUse a local permission system to protect pages based on each user, not just whether that user is logged in.Adding Facebook and other providersDiscover additional OAuth providers and add Facebook authentication in your application, giving more choices for third-party auth.CompanyAbout UsWhy Udacity?BlogIn the NewsJobs at UdacityBecome a MentorPartner with UdacityResourcesCatalogCareer OutcomesHelp and FAQScholarshipsResource CenterFeatured ProgramsBusiness AnalyticsSQLAWS Cloud ArchitectData AnalystIntro to ProgrammingDigital MarketingSelf Driving Car EngineerOnly at UdacityArtificial IntelligenceDeep LearningDigital MarketingFlying Car and Autonomous Flight EngineerIntro to Self-Driving CarsMachine Learning EngineerRobotics Software EngineerAI Master’sMaster of Business AdministrationMaster of Science in AIUdacity SchoolsSchool of Animation and Game DevelopmentSchool of Artificial IntelligenceSchool of Autonomous SystemsSchool of BusinessCareer ResourcesSchool of Cloud ComputingSchool of CybersecuritySchool of Data ScienceSchool of DevOpsSchool of Executive LeadershipSchool of Product ManagementSchool of Programming and Development