From Market Ruler Help
Online Marketers can be broken down based on the type of online marketing they offer:
- Search Engine Marketing (or SEM) are professionals who develop, manage, and monitor Pay Per Click marketing campagins.
- Search Engine Optimization (or SEO) are professionals who modify or improve your existing site (or sites) to better rank in Search Engine Results Pages.
Because each type of Online Marketing requires different skills, businesses need to hire two different professionals to focus on each.
See Online Marketing.