Search Engine Marketing. A euphemism for paying for placement on Search Engine Results Pages (SERPs), most commonly through the mechanism of Google Adwords.
SEO
Search Engine Optimization. The practice of tailoring a website for greater visibility on Search Engine Results Pages (SERPs) in order to garner more traffic.
SERP
Search Engine Results Page i.e. the page you are taken to after googling something.
STR
Smith Travel and Research – a leading collector and supplier of hotel performance metrics.