Zombie villagers in Minecraft PE are a variant of infected villagers who have turned. These units will act like regular zombies and attack you with their hands. Although most beginners would panic and kill these hostile creatures, they must be preserved and cured.
Curing is a process exclusive to villagers, but only a few players might know how to cure them since the game does not tell the exact process. However, once the villagers are cured, you can employ them and trade items at a discounted price. Here is a simple method to do so in Minecraft PE.
What you need to cure a Minecraft PE zombie villager
1) Items to have before curing a zombie villager
2) Trap the zombie villager
4) Feed the golden apple
The villager will become normal after curing and will not attack you. Moreover, it will remember the cure and offer you discounts on trades. Players have also found a way to repeatedly zombify a villager and cure them to keep reducing trade prices. Such a process has become quite famous since players can bring down trade prices to one emerald per item.