What does it mean?
As an example, I spent 1/2 hr on the phone yesterday chatting with my cell phone service provider about my services, "What plan should I get? What makes the most sense for me?" Ultimately, I have to trust that they know what they're talking about and have my best interest at heart. It can feel like a leap of faith, and it is.
I recently ran across a blog post that's well written, easy to understand worth a read.
by Roberto Blake
As technology evolves, so do the ways we experience information and media. With the success of the iPhone with its launch in 2007, the way we consume media—and our expectations—have changed dramatically.
Businesses without a website are not taken nearly as seriously by most people anymore, prompting the need for more sophisticated approaches. People no longer use telephone books to find companies or individuals to do business with. They perform Google searches, and today typically they do this on the go with a mobile device.
The mobile experience of your website is now more often than not becoming the first experience people have of your website, and it communicates to them whether or not you are outdated or professional. That is why designing your website to be “mobile first” is a priority. What is meant by “mobile first web design,” is the idea of designing your website with an eye towards how it presents on mobile devices as the first priority rather than an afterthought.
There are two web design methods you can employ: adaptive or responsive.