(1) e-books. It is an official book publication issued in digital format;
(2) Electronic journals. Including electronic newspapers, electronic magazines and periodicals, electronic news and information services (NIS).
(3) database. Refers to the collection of a large number of information objects, allowing users to search according to certain attributes. There are various databases on the Internet, such as thematic databases, book catalogues and address books.
(4) Virtual library. Refers to the online information database established by serious academic and scientific research institutions. These databases tend to focus on one or several topics, widely collect online academic works and related websites, classify and catalogue them according to certain rules, some use hypertext to establish indexes, and some use keywords to search.
(5) electronic encyclopedia. Electronic encyclopedia (including electronic dictionary).
(6) Educational websites. Including: teaching, education, research, resources, integration and so on.
(7) electronic forums. Refers to online discussions supported by newsgroups and BBS.
(8) Virtual software library. Virtual software library collects free and trial software, which can be downloaded and used for free, but the trial period is limited.