What does it mean that the company specializes in online recruitment?

My personal understanding is to help companies publish recruitment information on the Internet. There are some platforms on the Internet that can publish recruitment information in a free or paid way. What specializes in online recruitment is online recruitment. You can also follow up a series of things through internet communication, including publishing company information, recruiting requirements, receiving resumes, sending out interview channels, and arranging off-line interviews, that is, in real life, determining the latest personnel.