A log or stem is a naturally occurring block found in trees or huge fungi, primarily used to create planks. It comes in eight types: oak, spruce, birch, jungle, acacia, dark oak, crimson and warped. A stripped log or stripped stem is a variant obtained by using an axe on a log or a stem respectively. https://minecraft.gamepedia.com/Log <-- to learn more about the stripped crimson stem click on the link