How are “frames” called in the Landing Page, how are they made to full height, and how are they scrolling to the next frame?

Question

css

Hello! Could you tell me, please, how:
1) are called the "frames" that make up the LP?
2) how are they made to full height, even if, when the browser window is reduced, the frame still does not crawl out beyond the width / height of the browser?
3) how and/or what do they do smooth scrolling with the button at the bottom\mouse wheel to the next frame?
Example: armstalker.com

Answer 1

You need it - alvarotrigo.com/fullPage

Answer 2

height:100vh;