A toggle is a user interface control that offers two opposing states (on and off) and allows users to update settings, preferences, and other types of information. Toggles should be used sparingly. Overuse can confuse users and cause them to question whether their actions have actually made changes, which in turn can lead to a lower confidence score and a higher error rate. If a toggle does not deliver immediate results, it is better to use a checkbox or button instead.

When using toggles, it is important to provide clear and direct labels. In addition, colors are important to help users understand the current state of the toggle. A more pronounced color that signifies the active state can be helpful. However, it is also critical to evaluate societal and cultural implications of color and design cues, as they can create confusion for some audiences.

Feature toggles (also known as feature flags) support agile approaches to development by allowing teams to deploy features into production while they are still under development. In contrast, if these same features were being developed on code branches under more traditional waterfall development processes, they would have to be manually integrated into trunk code before they could be released.

A common use case is to provide users with an option to enable or disable accessibility features. This can help ensure that articles are accessible for visitors who have physical disabilities, visual impairments, or cognitive issues like autism and ADD/ADHD.