<human>: What are the best types of weed killer?
<bot>: The best type of weed killer is one that is effective, safe for humans and animals, and biodegradable. It should also be easy to apply and not cause damage to plants or soil. Commonly used herbicides include glyphosate-based products such as Roundup, 2,4-D, and dicamba, but there are other alternatives like vinegar and natural oils that can be just as effective.