What/where is a flyback transformer ?

[SAE2922]

About 20 years ago, I paid a tech to replace a flyback on my old Toshiba 19" when the CRT went to black and nasty fumes invaded the room. I could literally see the heat waves rising out of the top ventilation slots on the rear cover.

The TV was against a white wall and I could see the heat waves distorting the air above the set. Needless to say, whenever I noticed (and smelled the problem), I moved quickly to kill the TV.

I have heard other TV techs over the years talk about the flyback, as well as you guys here on AK slinging that term about.

So, what is it used for and where is it located on a TV?

I borrowed an attachment photo from a post by Ampico-kid on his 1947 DuMont Clifton. If somebody would kindly clue me in to the function and location, I would appreciate it. Yeah, I know, I could look it up on the web, but it wouldn't be as much fun to learn.