It includes email marketing, search engine marketing (SEM), social media marketing, many types of display advertising (including web banner advertising),
and mobile advertising. Like other advertising media, online advertising frequently involves both a publisher, who integrates advertisements into
its online content, and an advertiser, who provides the advertisements to be displayed on the publisher's content. Other potential participants
include advertising agencies who help generate and place the ad copy, an ad server which technologically delivers the ad and tracks statistics,
and advertising affiliates who do independent promotional work for the advertiser.
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