Trees

A device that heats cannabis flower to a temperature that volatilizes the terpenes and cannabinoids, but does not allow for combustion of the material

I looked to find a decent 101 on dry herb vapes but alas the eshittification of the internet continued and I couldn't find any sites that aren't also trying to sell something.

So in addition to wht others have explained, here's a bit of extra info from the best two pages I could find:

https://www.planetofthevapes.com/blogs/blog/how-to-vape-dry-herbs-for-beginners

https://thevape.guide/how-do-dry-herb-vaporizers-work/

Dry herb vaping also advantage of working with plain flower so you know what you're vaping as opposed to refined vaping products like juices, waxes, oils, etc. which can have additives that aren't so good for you.

Instead of lighting your herb on fire to smoke it (combustion) vaporization uses an electric oven to bake your flower to a specific temp at which the cannabanoids release as smoke while the flower slowly bakes (vaporization). The resulting smoke is a lot cleaner on your lungs and you can get a lot more out of it. .2 g is 10 minutes of smoke in a vaporizer while 10 seconds of smoke in a bowl

The resulting vaporized herb is also a useful byproduct. Its effectively poorly decarbolized flower that you can use to make cannabutter with.