The verb estar tells how one feels or where one is. Esta is the he/she/it conjucation of estar and so it translates to he/she/it feels or is
"Como esta" translates to "how are you" in English.
It can be translated to English as followed. This or this is.
It is deactivated.
its in english
"Esta buena chica" translates to "this good girl."
Ésta allí---This one (noun in fem. gender) over there
You (formal)/it/he/she is/are surrounded
Machine
He is dead
I am tired.
that means how are you
He is tired.