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+Docker Tagging for Instant Rollbacks
+A Docker Tag is essentially an "alias" or a "pointer" to a specific Image ID. Think of it like a git branch or a file shortcut; it allows you to label a specific version of your app so you can find it later.
+. The "Safety Bookmark" Strategy
+Before you pull a new update (which usually overwrites the :latest tag), manually "bookmark" your currently working image.
+Command:
+Bash
+docker tag my-app:latest my-app:confirmed-working
+    Result: You now have two tags pointing to the same Image ID. When you pull a new :latest, your confirmed-working tag stays pointed at the old, stable code.
+. The Instant Rollback
+If the new update fails, you don't need to download anything or check logs. You simply re-deploy using your bookmark.
+Via Docker Compose:
+Change your image: line and restart.
+YAML
+services:
+  web:
+    image: my-app:confirmed-working

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