In general, the ID number is very important to both the employer and the job seeker, such as name, gender, age, marital status, household registration, address, education, professional title, working years, job hunting intention, etc. Employers know the profile of job seekers through profiles, and job seekers introduce or show themselves through profiles.

As for the ID number, companies generally don't want to know it before recruitment, and they don't care too much, so they don't have to write it. But writing it out also has some advantages, which can increase the credit of the unit for your integrity (but not much).

Generally speaking, the ID number can be written or not. If you are hired, you will definitely need your ID card and ID number.