SEM – Search Engine Marketing is frequently defined as pay-per-click or PPC but can also refer to the entire process of online marketing.
SEO – Search Engine Optimization makes your pay-per-click more effective and improves you organic search placement.
SMM – Social Media Marketing uses the wide spectrum of social media to define your business.
Internet Marketing by sem[c] means using the entire range of the above techniques to make your website a more effective business tool.