Can someone explain onboarding admin?

Hi,

For a while now I've been trying to find a role where I can use both my IT and Business diplomas (Not US collage diplomas) And I was told about this. It seems like a great fit. What would the day to day look like if I was doing this? Are these jobs seen normally seen as a higher-level role? Or can it just depend on the company?

Also what would the more common job titles be for this job? It's just that I've seen a few jobs that are basically onboard admin but none of them use onboarding admin as the job title.

Thanks.