Website Design and Search Engine Optimisation (SEO) are two very separate and different disciplines.
The first is about creating, designing and structuring a website so that a business has a presence on the internet. It allows a business to provide information to customers and clients about the products and services offered by the business and it can enable those customers and clients to order and pay for the products and services offered.
A website designer must ensure that the website is SEO friendly and although there are several elements to this, all of which are technical, it is relatively easy to achieve. Beyond this, a website designer has no control over the SEO for a given website.
Not all businesses need to be concerned about SEO. Once a website is finished, the website and the business can then be promoted and marketed in numerous different ways without concern or consideration for SEO. Traditional marketing methods such as e-mail campaigns, direct mail, advertising etc. etc. can be employed to drive potential customers to the website. In effect, customers are driven to the website by the promotions and marketing employed by the business.
SEO is only a concern if a business wants to attract new customers that are interested in purchasing a product or service that the business offers but are unaware of the existence of your business.
For example, if a customer wants to buy some ‘blue widgets’
The sole purpose of SEO is to ensure that when a prospective customer searches for a product or service, offered by your business, your website appears at the top or as near to the top as possible on the search page results.
Research has shown that if your website is not on the first page of the search results then your business is effectively invisible to potential new customers. The research shows
Googles 'Search Engine Optimisation - Starter Guide' can be found here.
Google continuously updates and changes