CodeScience is a Salesforce consulting firm that was founded in 2008 with 75 employees across offices in Chattanooga and San Francisco. They have built over 90 apps on the Salesforce AppExchange and provide professional services focused on the Salesforce platform. Lightning Out allows developers to render Lightning components outside of Salesforce, including in mobile apps, web pages, and other platforms. It uses OAuth for authentication and handles security through features like CORS and HTTPS. Developers can build Lightning Out applications using JavaScript frameworks in Node.js, SharePoint, and other platforms.