What type of advertising language tends to make extravagant and unrealistic claims about products without saying anything concrete, making it difficult to prove the truth or falsehood of the claim?

What type of advertising language tends to make extravagant and unrealistic claims about products without saying anything concrete, making it difficult to prove the truth or falsehood of the claim? Puffery. Puffery is defined as speaking or writing with false praise or exaggeration. This can be done with any type of writing/language but is common in advertising a product or service. It's hard to know what information is actually true about the product or service and what is spread far from it.