I submitted my resume online, and then sent me a text message to attend the campus presentation. What does this mean? What can the demonstration do?

Presentation is a question-and-answer thing that the company does for the campus.

At the presentation, the company will introduce the nature, mode and recruitment of the company. You can learn about the company through this demonstration, which is a live interaction. In fact, it is similar to recruitment, except that there is an additional process to promote the company.