@Susan-Lynn1
Airbnb or the host may require ID be verified, or if guest needs to upload government ID.
https://www.airbnb.com/help/article/1237/verifying-your-identity
Host would need to select their booking requirements for all guest. While Airbnb only requires some guest to upload information when attempting to make a reservation. Also if a guest profile simply says "ID verified" the host wouldn't know if the guest only provided phone, email, or if they uploaded a government ID. (Unless host using Instant Book require it, see below.)
I and many host wish Airbnb would require government ID for all guest before booking.
Here is a little more info about booking settings.
Host can choose Request to Book or Instant Book.
For Request to Book, host also can't see the guest profile picture when requesting to book so if guest also doesn't complete profile the host can be looking a black screen with no reviews, so its a good idea for guest to include a relevant first message.
However, for Instant Book, host can select that guest need to upload government ID and guest could instant book. Host may also require a profile picture, and previous reviews to instant book.
But once a guest has one positive review they can usually Instant Book and host would also approve a request to book if there are no other red flags. Guest usually want to find the best place to stay so are fine with any of the booking requirements a host may have as each listing is different and some carry much higher risk and liability and even concern for personal safety.