This is the 1639th most frequent Spanish word.
juega
"Juega" means "plays" (third-person singular form of the verb "jugar").
Here, 'juega' is used as the third person singular (él/ella/usted) conjugation of the verb 'jugar' in the present tense, indicating that he participates in a sport regularly.
Él juega al fútbol todos los días.
He plays soccer every day.
In this context, 'juega' illustrates its usage in referring to an activity someone engages in (playing cards). It highlights recreational use as opposed to organized sports.
Mis amigos y yo jugamos a las cartas después de la cena.
My friends and I play cards after dinner.
Here, 'juega' is part of a question, used impersonally in a structure asking about how something is done or performed.