Asterisk & Druid


Sorry, if you get bother of this question because it is very much general question but I have confusion in my mind. I am new one on Asterisk and trying to get understand is it hardware or software. I have query on my notebook. “Druid & Asterisk”.

Can any one help me to get understand what is this and what is the relation between these.

How we can use Druid and what is this.

Can we use Asterisk on windows XP for practice purpose.

Thanks in advance.