Websites have a lot of variety, both in design and purpose. You could have a brochure site to raise brand awareness, you could have an ecommerce site to sell your product or you could have an online Gallery to show off your content.
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A major factor in deciding on the design of your website is the Industry in which you work. The work you do will dramatically change what is needed on your website. If you produce chemical bonding agents, you will have no need for a gallery while if you're a designer you're going to need to show off your previous work.
Let's take a look at the difference in website designs for a few diverse industries...