Toggle is a button or switch that can be clicked to change between two different states or options. It is often used in technology, computing, programming, and user interfaces to enable or disable features, display modes, or settings. Toggle can also refer to an ornamental rod-shaped button for inserting into a large eye or loop in a chain or rope, as a fastener.

In web design toggles can be used to structure article content so that it is easier for visitors to scan and find the content they need. Collapsible toggles and accordions can also help to minimize scrolling on long pages.

Toggles can be used in combination with Multivariate Testing to make data-driven optimizations to a website or application. They can be applied to things like the Purchase Flow in an ecommerce system, the Call To Action wording on a button, or even the content of a landing page.

Savvy teams view their Feature Toggles as inventory that comes with a carrying cost and they seek to keep the number of toggles as low as possible. This requires the team to be proactive about removing toggles that are no longer needed. Some teams have a policy of adding a toggle removal task to their backlog each time they introduce a new Release Toggle. Other teams have gone as far as to put “expiration dates” on their toggles which will cause the system to fail a test (or even refuse to start) if they remain active after an expiration date.