A mobile device is any gadget you can easily carry around and use while moving. These devices have a touchscreen, connect to the internet wirelessly, and fit in your hand or bag. Common examples include smartphones, tablets, and smartwatches.

Today's mobile devices do much more than make calls or send messages. They come with cameras, maps, and sensors that help you do many everyday tasks. Think of them as small computers that fit in your pocket.

Most people now browse the internet and use apps primarily on their mobile devices. This makes it essential for designers to focus on mobile-friendly designs when creating websites and apps.