This is the 36th most frequent Spanish word.
además
"Besides" or "in addition."
Here, 'además' is part of a phrase meaning 'besides' or 'in addition to', indicating an additional activity.
Estuvieron en casa además de ir al cine.
They stayed at home besides going to the cinema.
In this example, 'además' is used to provide additional, supporting information to the preceding statement.
Me gusta leer; además, la lectura mejora el vocabulario.
I like to read; besides, reading improves vocabulary.
In this sentence, 'además' is used as a transitional adverb meaning 'moreover' or 'furthermore', introducing an additional point.