What is the explanation of "esta aquii"?

Answers: está aquí...with the correct tildas...finances: he/she/it is here

without the tildas: this, here (as within I would like another one similar to this, here that I have surrounded by my hand.)

esta way it is, aquii means here it's here

Está aquí process: 'It is here.'

However, it can also mean:
'He/she is here.'

It depends on the connotation of the sentence and if you choose to use the pronouns.