By the way / Incidentally
Used to introduce a new, usually related topic, or to add an afterthought to the conversation. Direct equivalent of 'by the way' in English.
By the way, have you spoken to Miguel lately?
I forgot to tell you, by the way, that I can't tomorrow.
—By the way, how did the meeting go? —Fine, thanks.
By the way, how is your brother?
By the way, tomorrow is his birthday.