Answer:
The anchor bolt goes a long ways beyond the nail in the sheetrock to hang a picture. Call it "overkill" but I'd use a sheetrock molly to hang a duck feather. I hate to see that loose nail in the brittle sheetrock. Anchor bolts are similar to sheetrock anchors but deal more with concrete structures.
An anchor bolt is used primarily to attach an object of any sorts to concrete. It could be used to attach the bottom plate of your house's foundation or to hang your boombox in your downstairs workshop.
There are a wide variety of sizes and styles of anchor bolts. For instance, I use J-bolts as anchors for deck posts. You set the bolt in your footing concrete while it is wet and after the concrete hardens you have a solid bolt to attach your post bracket too.
Involving the same deck scenario, you could use another style of anchor bolt. You could pour your footing without any bolts in the concrete and set them in after it hardens. You do this by drilling a hole specified on the package and then hammering your bolt into the hole drilled. There is a sleeve around these anchor bolts that grabs the inside of the hole to provide a sturdy bolt to attach your post bracket too.
I could probably list a 1000 uses. All you need to know is that if you want to attach something to concrete, visit your local hardware store and find the right anchor bolt for the job.
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