Why do we use JDK and JRE?

Related questions

1. What is the purpose of JRE?
2. Is Eclipse the best IDE for Java?
3. What JDK is needed for Eclipse?
4. Is JRE different from JVM?
5. Do I need to install both JRE and JDK?
6. Does JRE contain JVM?
7. Is Jdk an IDE?

Tags

1. #execution
2. #plugins
3. #where
4. #applets
5. #basically
6. #useful
7. #necessary
8. #machine
9. #includes
10. #virtual
11. #applet
12. #applications
13. #compilers
14. #programs
15. #debuggers
16. #tools
17. #development
18. #abstract
19. #developing
20. #command
21. #browser