Final answer:
Mobile devices such as digital cameras, portable and digital media players, e-book readers, wearable devices, and game devices serve different purposes, including capturing photos, playing media files, reading digital content, tracking health data, and gaming.
Step-by-step explanation:
The purpose of mobile devices such as digital cameras is to capture high-quality photos and videos. Portable and digital media players are designed to play audio and video files, providing entertainment on the go. E-book readers allow users to read digital books, magazines, and other content. Wearable devices, like smartwatches, track health data and provide notifications. Game devices are designed for gaming purposes, offering entertainment and immersive experiences.