Which of the following best represents the concept of continuity?

The concept of continuity in user experience refers to providing a seamless and consistent interaction across different platforms or devices. When users switch between platforms, they should feel as though they are on a single, cohesive journey, rather than encountering significant differences that disrupt their experience.

In this context, the option that best embodies continuity is when user progress is saved across all platforms. This means that, regardless of whether a user is accessing a service via a mobile device or a desktop, they can pick up right where they left off, which enhances usability and satisfaction. It encourages users to engage more deeply with the product since they do not have to repeat tasks or lose their previous work, fostering a more integrated experience.

The other options, while they each have their place in UX considerations, do not support the principle of continuity in the same way. Separate accounts for each platform create division rather than a unified experience. Different functionalities can lead to confusion or additional learning curves for users, breaking the fluidity of their experience. Content exclusively designed for desktop use does not account for users who might want to access the content on other devices, hindering the continuity of experience across platforms.