Fence

Fences
Wooden Fences are blocks in Minecraft added in early Alpha. Back then when they were first added, nothing could be placed on them, and they could be jumped over. Now in Minecraft many other blocks can be placed on them including Torches making nice looking balconies.

When blocks are placed on Fences, they count as 2 blocks but alone they count as 1.5. Nether Brick Fences are an equivalent of regular wooden ones but are crafted using Nether Brick blocks. Nether Brick Fences share the same properties as regular fences, they also naturally generate in Nether Fortresses.

The primary use for fences is to border an area of. Although it stops mobs from going in, it doesn't stop Skeletons from shooting over them. Also Spiders can still climb over them.