How to terminate processes in ubuntu??

In windows we can easily terminate the process by

• ctrl+alt+del 
• right click on program name
• go to process
• end process.

but in Linux , it is not that much easy, u have to follow the terminal steps:

example: to close firefox process.

• Open terminal (ctrl+alt+t)
• type command : ps auxwww | grep firefox
• u will get some table , in which u find process IDs
• type command : kill 2348 (note: 2384 is process id, it is different each time )

Kill process is very useful when your program is not responding.