Esta is one conjugation of Estar or "To be".
Estar - to be
Estoy - I am
Esta - He/She/Article Is
Estas - They are
Estando - being
Estan - They are
Estamos - We are
Not to be confused with este, which means, "This".
"Como esta" translates to "how are you" in English.
No esta aburido means in English not good bye.
It can be translated to English as. This: How are you ?
Mi casa esta --- something like ""My house, the one here"
Ésta allí---This one (noun in fem. gender) over there
It can be translated to English as followed. This or this is.
"Esta buena chica" translates to "this good girl."
One is.
It's OK
its in english
It is deactivated.
That means, "This is your girl-friend; she is pretty."