Threading Concept in Linux....?

Hi all,

1) I have a small doubt in Linux Basics.
Wether the Linux having threading concept ?
I heard Linux treat everything as a process ? Is it true ?
If not how can i found that linux suppport threading concept ?


2) I would like to know the difference between Process/Thread and
Task.

Can any one clarify my doubt...it will be great helpfull for me.
Thanks in advance

.

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