A website is much more than a group of pages connected by links. It’s an interface, a space where different things — in this case, a person and a company’s or individual’s web presence — meet, communicate, and affect each other. That interaction creates an experience for the visitor, and as a web designer, it’s your job to ensure that experience is as good as it can possibly be.

Interface design, which focuses on the layout of functionality of interfaces, is a subset of user experience design, which focuses on the bigger picture: that is, the whole experience, not just the interface.

a.Know your users
Above all else, you have to know who your users are—inside and out. That means knowing all the demographic data your analytics app(s) can pull, yes. But more importantly, it means knowing what they need, and what stands in the way of them achieving their goals.

Getting to that level of empathy requires more than careful analysis of stats. It requires getting to know the people who use your website. It means speaking with them face to face, watching them use your product (and maybe others), and asking them questions that go deeper than, "What do you think of this design?" What are their goals? What stands in the way of them achieving those goals? How can a website help them overcome or work around those challenges?

a.Define how people use your interface
Before you design your interface, you need to define how people will use it. With the increasing prevalence of touch-based devices, it’s a more pivotal concern than you might think. People use websites and apps in two ways: directly (by interacting with the interface elements of the product) and indirectly (by interacting with UI elements external to the product).

Conclusion
Who your users are and what devices they use, should deeply inform your decisions to the makers of custom web design services.