1.1. used for implementing operating systems and embedded applications.
2. OBJECTIVE-C
2.1. apple
3. PHP
3.1. html
3.2. facebook
3.3. wordpress
4. RUBY
4.1. Scribd, GitHub, Groupon and Shopify
5. SQL
5.1. is a special-purpose language for managing data in relational database management systems. It is most commonly used for its "Query" function, which searches informational databases.