1. JavaScript: Essential for dynamic and interactive web pages.
2. Python: Backend development, powering sites like Instagram.
3. Java: Used for robust backend systems, e.g., LinkedIn.
4. Ruby: Known for simplicity; used in projects like GitHub.
5. PHP: Server-side scripting language, common in WordPress.
6. C#: Microsoft's language; used in ASP.NET applications.
7. Go (Golang): Google's language, known for efficiency.