This document provides definitions for common modern marketing terms. It defines terms like A/B testing, big data, blogging, bootstrapping, cohort analysis, conversion rate, growth hacking, earned vs owned vs paid media, pivot, programming languages, product-market fit, viral coefficient, search engine optimization, paid search, email marketing, inbound marketing, lead magnets, content marketing, lead management, premium content development, social media management, and social advertising management. The definitions cover concepts and strategies relevant to digital marketing, content creation, analytics, and business growth.