Due to the increasing amount of data available online, the World Wide Web has becoming one of the most valuable resources for information retrievals and knowledge discoveries. Web mining technologies are the right solutions for knowledge discovery on the Web. The knowledge extracted from the Web can be used to raise the performances for Web information retrievals, question answering, and Web based data warehousing. In this paper, we provide an introduction of Web mining as well as a review of the Web mining categories. Then we focus on one of these categories: the Web structure mining. Within this category,

investigate the practice of online teaching/learning during pandemic 'lockdown' and the associated benefits and challenges. More specifically, we set out to answer the following questions:• What educational technologies are instructors using to conduct classes and in which format?Abstract-The COVID-19 pandemic triggered unprecedented adoption of online education in universities and digital technologies are increasingly becoming an essential part of the learning and teaching experience. From within an ongoing pandemic 'lockdown', this study investigates the current landscape of online education with a focus on the learning and teaching experience in virtual classrooms compared to physical classrooms. We found that instructors typically combine multiple technologies to create a holistic learning experience for students. The benefits of virtual classrooms included self-paced learning, increased opportunities to gain procedural knowledge, diversified communication channels, and greater opportunities for learning analytics. Compared to physical classrooms, the drawbacks of virtual classrooms included the lack of both timely access to all information through a single interface and natural interpersonal interaction. Based on our findings we recommend instructors to remain flexible when selecting technologies and to adapt the level of offline learning to fit their students' learning styles and abilities. We also identified opportunities for virtual reality technology to mitigate the drawbacks of online education by helping to translate in-class experience to virtual spaces.

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