There are many steps that go into creating a viable, functional website. It is more than adding pretty images and some text here or there. Every step and every piece must come together for the overall purpose of making the site work for you.
The graphic to the left gives a visual explanation of the overall process of website creation.
BTW I cannot take credit for the info graphic, it was from an article at www.sitepoint.com/infographic-behind-scenes-guide-creating-website-clients/