Content Strategy as "... planning, developing and managing content - written or in other media". Or, in other words, your blueprint for using content in every aspect of your business.
To help us understand the entire content strategy, let's think first about building plans for a house, aka blueprints . The plans are extremely detailed and plan all aspects of building a house before the foundation is poured. These small maps detail specific measurements, where to run wires and plumbing, where your support beams will go and even where to put appliances, doors and shrubs.
On the other hand, content marketing is usually an inbound marketing technique for attracting and retaining customers by creating and delivering relevant and meaningful content. It's basically a combination of sales techniques and organic marketing, all in one. The trick is to hide enough your efforts so that your customers do not know that an offer is presented to them, but rather that they feel better informed. In content marketing, you designate specific audiences to which you want to send content, and once they bite, you help drive conversion with consistent content that you think will help influence their behavior.