What is Sightly/HTL?

Sightly, now known as the HTML Template Language (HTL), is a template system used primarily within Adobe Experience Manager (AEM). It defines a secure and efficient way to create dynamic web content, focusing on separation of concerns. HTL emphasizes logic-less templating, where business logic is handled in Java servlets or Sling models, and HTL focuses on rendering the data. This improves security, maintainability, and performance.