Vines

Vines are climbable non-solid vegetation blocks that grow on walls.

Vines can be destroyed with any item, but using shears is the only way to collect them. Shears enchanted with Efficiency are more efficient when used on vines; Efficiency II and above allows vines to be instantly broken.[1] Using an axe on vines can also increase efficiency, but does not allow for collection, even with Silk Touch. If multiple vines exist within the same block space, breaking one of them breaks all of them instead of just the one targeted[2] and results in only a single vine dropping[3]. Shears used by a dispenser cannot break vines.

Vines are naturally generated in jungles, swamps, mangrove swamps and lush caves. Jungle trees of both sizes have vines on their trunks and canopy edges, and vines grow on the sides of jungle terrain. Vines are also naturally generated on oak trees in swamps and mangrove trees. In Bedrock Edition, vines can also generate on dying oak, spruce, jungle and dark oak trees.