Why Google Chrome uses multiple .exe files in the background?

I am a big fan of Mozilla Firefox and it is running quite well in my laptop.  In fact I was using Google Chrome earlier and found it eating away my CPU memory a lot.  It almost freezes my laptop at times.  It also uses multiple Chrome.exe files in the background and I don’t know why they are using multiple .exe files?  You can check it through task manager when Google Chrome is running in your computer.  These exe files consume a lot of memory which in turn make my computer numb.

Has anybody got an idea about why Google Chrome uses multiple exe files?