“Mobile-friendly” simply means that your website’s content and assets are accessible, legible, and usable to visitors on a smartphone.
Have you ever found yourself on a website that doesn’t display well on your tiny phone screen? A website where you have to zoom and pinch to read small text and clumsily click tiny buttons with what feel like giant sausage-like fingers?
In the past, most companies elected to build a custom mobile website. However, building a custom responsive website is now industry standard.