Short answers, pulled from the story.
Saturday Night Live first aired on the 11th of October 1975 and was created by Lorne Michaels. The premiere episode originally bore the title NBC's Saturday Night and featured comedian George Carlin as the host.
The initial cast included Dan Aykroyd, John Belushi, Chevy Chase, Jane Curtin, Garrett Morris, Laraine Newman, and Gilda Radner. These seven performers were recruited largely from The National Lampoon Radio Hour and became known as the Not Ready for Prime-Time Players.
The 1994 to 1995 season is considered one of the series' worst due to internal conflict and a widely publicized profile in New York that criticized the show's humor and backstage dysfunction. NBC executives began interfering in the show and recommended firing new stars like Chris Farley and Adam Sandler, while ratings began to decline.
The New York City cast and crew were highly affected by the September 11 attacks in 2001 and returned on the 29th of September with an appearance by Rudy Giuliani. Political humor was reduced for the following seasons, but the show switched to high-definition broadcasting for the 2005 to 2006 season.
The 2019 to 2020 season was indefinitely halted on the 16th of March 2020 and later resumed in April with three remotely produced episodes labeled Saturday Night Live at Home. The show returned to Studio 8H in October 2020.
Channels in other countries including Brazil, Germany, Spain, South Korea, Japan, Russia, Canada, Finland, France, Italy, and Poland have created their own versions of the show. The South Korean version SNL Korea premiered on the 3rd of December 2011 and has completed nine seasons with 205 episodes.