Explore authentication techniques and best practices for user identification in this 28-minute JSConf EU 2013 talk by Tim Messerschmidt. Delve into methods ranging from Basic Authentication to advanced technologies like OAuth 2.0 and OpenID Connect. Gain insights on choosing the right identity provider (e.g., Facebook, Twitter, PayPal, Google Plus) for different scenarios. Learn about the distinctions between authentication and authorization, and understand the implications of using various identity providers. Discover the potential applications of authentication beyond traditional use cases, including JSONP Cross-domain Requests. By the end of this presentation, acquire a comprehensive overview of user authentication strategies to enhance user experience in your services.