Leads are quite a useful item in Minecraft and have a variety of functions. If you remember the early days of Minecraft, transporting mobs in the game was a long and tedious process, without any effective methods. The lead item was added to Minecraft back in 2013 as part of the Horse Up...
Everything about smithing tables in Minecraft: how to make them, how to use them, and why you'd even want to think about them.