You must develop, build, and run a website with growth of that website in mind. The key feature that makes a website scalable is that any resources within your website, and the access associated with those resources, can be distributed to an ever growing viewer population. 

There are a number of features that go into planning for your website’s future, of which scalability matters. Think of a time when a prominent website
has gone down, even for a few minutes. It feels like a disaster. You want to make sure that your website remains available as it grows. When thinking
in scalable terms, you will want to consider key component redundancy, and how to recover quickly from any partial system failures. You will also want
to develop your website to have a fast response time. Furthermore, a website ought to be reliable with the same links resulting in the same outcome.
The ability to adequately manage a website is indispensable. You need to be able to find the source of a problem when it arises, easily update or change
portions of the site, and keep the system somewhat simple for consistency. 

Now, scalability deserves much focus. The equation here is all about the ability of a website to accommodate a need for increased capacity for incoming load. A number of parameters fall under scalability. As traffic increases in website users, that website must adjust to a greater number of users and the increase in data required. Additionally, you will want to have the ability to improve and increase the storage capacity of your site, as the need for more storage develops. As the number of users increases, and more storage becomes available, you will also need to accommodate for growth in transaction numbers. All of this takes data and you need a website that scales in conjunction with the increase in data requirements.