multiple process - chrome

I wondered why google chrome creates multiple process
when I actually observed in my windows task bar.
After some researches on this topic got a bit of information
that chrome architecture supports multiple process
inorder to handle the large,dynamic data. unless other
browsers ( except IE8, which also supports multiple processes)
each website is a new process in chrome however
the links we click from the website will follow the same
process. One advantage of this architecture
is, there is no need to restart your browser if one process
fails, you can just kill that process. But its also true that
memory usage will be little more than single process architecture.