Inbound marketing has been growing since 2006 and is now widely accepted as the primary marketing methodology for doing business in the digital age.
Traditional marketing methods are considered outbound because they rely on buying ads and email lists and hoping for leads. By responding to requests for information on the web, inbound marketing pulls the inquiring prospect toward your company and product in order to satisfy their need.
By positioning your website's published content with your customer's interests (Attract them), your company becomes an authoritative resource for them.
You then nurture their interest (Convert them) until they are prepared to become customers (Close them) and you continue to support them so that they promote your company to others. (Delight them).