Is Zhong Jian's proposal email or SMS?

An offer is usually made in the form of a letter or notice, which can be paper or electronic.

An employment letter is an employment notice sent by an employer to a job seeker. It's like a college admission notice. It is usually sent to job seekers in the form of notices or letters. Due to the increasing popularity of electronic office, Offer is usually sent to the mailbox of job seekers in the form of e-mail.

Of course, some companies don't pay so much attention to recruitment, so sometimes office may just be a phone call to inform you of employment directly on the phone.