[cmdkeen]

This concept is will known in the military as BLUF - bottom line up front. Not an abstract or introduction, putting the key recommendation or outcome at the beginning. It falls in and out of fashion but as with newspapers it helps you work out what you want to read further.

[dizzy3gg]

Known on the internet as TL;DR

[rdancer]

Tl;dr is an antipattern, and it's easy to see why.

Lead with a strong point. Pique youre reader's interest. Then, and only then, will they lap up your wall of text. Tl;dr is a gag, a joke, mockery of bad writing style. If you find yourself using it in a serious way, as a crutch, stop, rewrite, don't go down that path.

[xtrumanx]

TL;DR doesn't always appear at the beginning which is what cmdkeen was talking about.