What is Inbound Marketing?

HubSpot says that “Inbound marketing focuses on creating quality content that pulls people toward your company and product, where they naturally want to be. By aligning the content you publish with your customer’s interests, you naturally attract inbound traffic that you can then convert, close, and delight over time.” So, if that's inbound, then what is outbound marketing? This form of marketing, also called interruptive marketing, uses tactics such as direct mail, print ads, trade shows, telemarketing and both TV and radio ads. This type of advertising can be expensive and does not build those long-term relationships.