Why don't people bring their resumes in interviews nowadays, or they don't have any resumes, so just introduce yourself?
It's normal not to bring a resume, because the website will send a resume to the company when you join the company. Unless the company wants to know your personal information, it will fill it in on the spot. Another is to bring a resume to confirm the identity of the person who joined the job, because there will be many recruiters, which is easy to be confused.