CMS: Content Marketing System (software to create, edit webpages)
COS: Content Optimization System (optimization to reach the largest possible target audience.)
CPA: Cost per Action, also Cost per Acquisition
CPC: Cost per Click
CPL: COST PER Lead
CPM: Cost per one thousand impressions
CR: Conversion Rate
CRM: Customer Relationship Management (software)
CTA: Call to Action
CTR: Click Through Rate
KPI: Key Performance Indicator
LTV: Life Time Value (of a customer)
PPC: Pay per Click
PPL: Pay per Lead
PPS: Pay per Sale
PV: Page View
ROI: Return on Investment
SAAS: Software as a Service
SEO: Search Engine Optimization
SEM: Search Engine Marketing
SERP: Search Engine Results Pages
SMM: Social Media Marketing