marketing is about communicating the value of a product, service or brand to customers or consumers for the purpose of promoting or selling that product, service, or brand. the oldest – and perhaps simplest and most natural form of marketing – is 'word of mouth' (wom) marketing, in which consumers convey their experiences of a product, service or brand in their day-to-day communications with others. these communications can of course be either positive or negative. in recent times, the internet has provided a platform for mass, electronic wom marketing (e-wom), with consumers actively engaged in rating and commenting on goods and services. digital marketing is an umbrella term for the targeted, measurable, and interactive marketing of products or services using digital technologies to reach and convert leads into customers.the key objective is to promote brands, build preference and increase sales through various digital marketing techniques. it is embodied by an extensive selection of service, product and brand marketing tactics, which mainly use the internet as a core promotional medium, in addition to mobile and traditional tv and radio. online marketing dynamic marketing brand marketing e-mail marketing sms marketing whats app marketing social media marketing twitter marketing facebook marketing google+ marketing linkedin marketing instagram marketing youtube marketing seo (search engine optimization) smo (social media optimization) app promotion online app promotion product promotion