Difference: there is not much difference between a university lecture and a job fair. The only difference is that if there are many enterprises at the job fair, it is estimated that there will be less publicity for their own enterprises. It's all about preparing for work. If there is only one enterprise, the nature of both is the same.
Extended data:
Every year, large enterprises hold special publicity activities for graduates, mainly introducing the history, current situation and employment standards of enterprises, and there will be questions after the meeting. The general venue is the lecture hall of the university, and there will be posters before the event. In order to encourage students to come, some enterprises will distribute souvenirs about the enterprise to the students present, which is also a kind of publicity for the enterprise.
The general purpose is to promote corporate culture and answer questions, not to submit resumes as the main purpose. Every school's propaganda enterprise will be different. Generally, respected enterprises only arrange seminars for prestigious schools.