What happens in Latter-day Saint temple ceremonies?

This is such a great video explaining what 

Members of the Church of Jesus Christ of Latter-Day Saints believe.

https://youtu.be/UFJaQBcUeG4

https://www.havenlight.com/provo-city-center-gates-to-heaven?affiliate=khpi

Image Courtesy of Alan Fullmer, presented by HavenLight