Canvas launched in March 2025 and has been getting more powerful since. It's an interactive workspace that lives right inside Gemini - you select it from the prompt bar, and a side panel opens up where you and Gemini co-create in real time. The difference from a regular chat is that instead of responses just stacking up in a scrolling thread, everything lives in one persistent, editable document or project. You can go back in, tweak a specific section, highlight a paragraph and tell Gemini to rewrite just that part, adjust the tone, shorten it, whatever - without regenerating the whole thing f