Q: What is a Let's Play (LP) thread?
A: It's a documented playthrough of something that, at the very minimum, resembles a game; how the author chooses to present it is incredibly varied. Some use screenshots, some use video. Some let the readers make decisions, others plow on through and use the thread for discussion. Some are serious and informative while others are parodies.
I personally enjoy LPs a lot, since they give you a lot of knowledge about a plethora of different games while they're also usually quite funny with lots of witty remarks and the likes.
The one I'm going to show you is an LP of the video variety that follows a player through his journeys in Minecraft, starting off with nothing but two, err... one empty hand, he eventually builds a cave system known as "the X system", colonizes the Death Mountain, and visits the Nether. It's a great series for everyone, Minecraft newbs and nerds alike. Without further ado, I present to you X's Adventures in Minecraft, episode 1:
Except for Minecraft, davidr64yt (or X), also posts loads of videos on Starcraft and sometimes does playthroughs of other games, like Duke Nukem 3D and Half-Life 2. If you enjoy any of these games, I recommend you check him out.
Thanks for reading!