Depending on the internet marketing channel, internet marketing can be used reach new customers, engage interested customers and keep current customers up to date about your brand and to promote new products or services.
SEO and PPC are primarily used to reach new customers by getting your website to rank on the top of search engines when consumers are searching for products or services you offer.
SMM can be used to reach new consumers, engage interested consumers and to keep current customers up to date about your business.
Email marketing is primarily used to keep a list of subscribers up to date about your brand and to promote new products or services.
When you combine all these marketing channels, you are able to stay in front of new and existing consumers anytime they are thinking about a product or service you have to offer.