Wordpress.com Queries?

Wordpress
#1

Please explain below points of wordpress.com?

a) Totally free forever
b) No software maintenace

How above points are different in wordpress.org?

#2

WP.com is totally free hai Ispe aap jake Apna ek blog setup kr skte hai Aur jisme liye apko koi v software ki jarurt nhi padegi.
Aur isme limitetion hai

WP.org ye ek opne source CMS hai jo free hai.
Ise har koi Use kr skta hai
But Usko Use krne k liye apko ek hosting & domain ki need hogi