Wordpress.com Queries?

Please explain below points of wordpress.com?

a) Totally free forever
b) No software maintenace

How above points are different in wordpress.org?

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