Why are databases the preffered method of storing data by an information system

Explain how email technologies enable the exchange of messages between users. find out the typical parts of an email address and explain each part.

What is wi-fi infrastructure? a metropolitan area network that uses radio signals to transmit and receive data a communications technology aimed at providing high-speed wireless data over metropolitan area networks a means by which portable devices can connect wirelessly to a local area network, using access points that send and receive data via radio waves includes the inner workings of a wi-fi service or utility, including the signal transmitters, towers, or poles and additional equipment required to send out a wi-fi signal

Which boolean operator enables you to exclude a search term? a} not b} and c} or d} plus