$1)$What is e$-$commerce?$2)$Why is it important to study e$-$commerce?$3)$How does e$-$commerce differ from e$-$business?$4)$What are the unique features of e$-$commerce technology and what are their business significance?$5)$What is Web $2\mathrm{.}0?$ Give examples of Web $2\mathrm{.}0$ websites or apps$\mathrm{.}6)$Discuss the major types of E$-$commerce: B$2$C$,$ B$2$B$,$ C$2$C$,$ and social, mobile, and local e$-$commerce.