please help me to translate these four concepts into your own words. thanks

semantic web: set of design principles that will allow computers to be able to index Web sites, topics, and subjects, enabling computers to read Web pages and search engines to give richer and more accurate answers

network effect: notion that the value of a network (or tool or application based on a network) is dependent on the number of users

Enterprise 2.0: use of social media within a company's boundaries or between a company and its customers or stakeholders

employee portal: intranet portal used for enabling employee self-service for administering benefits, managing retirements plans, or other human resources-based applications