1. Different purposes: The main purpose of the roadshow is to show the innovation, feasibility and commercial value of the project to the judges and audience, so as to win their support and recognition; The main purpose of the defense is to answer the judges' questions and explain the technical realization, market prospect and business model of the project, thus proving the feasibility and commercial value of the project.

2. Different forms: roadshows are usually conducted in the form of speeches and exhibitions. The participating teams need to show the highlights and advantages of the project to the judges and audience through PPT, video and other means within the specified time; The defense is usually conducted in the form of questions and answers. The jury asks questions according to the content of the project, and the participating teams need to answer them within the specified time.