1. Search Engine Marketing (SEM): Promoting your brand or website on search engines like Google, Yahoo etc., SEM includes both PPC and SEO. PPC refers to Pay per click where one gets charged for every click made on their add , while SEO is a strategy of getting high ranking for specific keywords in search engines which helps you reach desired targeted audience. 2. Search Engine Optimization (SEO) : The art & science of making websites more visible to search engine crawlers so that they could ...