A website that is responsive adapts to the screen. Therefore, it works on computer screens as well as tablets and smartphones. I only build responsive websites. If you have an existing website that is not responsive, I can help you make it responsive.
Websites that are not responisve are rendered the same way on small screens as on big screens. The content shrinks and the text is hard to read and the links almost impossible to click. You often need to zoom in and out on a website that is not responsive.
The percentage of visitors that use smartphone vary from website to website. But expect it to be a majority – and that they will be annoyed if your website is not responsive.