A toast is a small message that appears briefly, often near the edge of a screen, and then disappears. It is like a quick spoken “Done!” after you finish a small task.
For example, after someone saves a note, a toast might say “Saved.” It confirms what happened without stopping the person from continuing to use the page.
Keep a toast short and do not put essential instructions in a message that vanishes quickly. If the person needs to make a choice or fix a problem, show a longer-lasting message they can act on.