Microsoft Teams Live Event provides some standard structure used in a traditional webinar environment. Examples of Teams Live Event features that would support “webinars” are options for Q&A, designating roles such as Organizer, Producer, or Presenter, as well as the option to create and archive (on-demand) recording.
It is important to note, though, that registration and other full-feature access for external webinar attendees are not currently available with the Teams Live Events feature. (That's where we come into the picture.)