How to find the End portal (stronghold) in Minecraft
Combine 1 Ender Pearl and 1 Blaze Powder in any crafting grid to get 1 Eye of Ender.

An Eye of Ender points the way to a stronghold and opens the End portal.
It is made with the Crafting Table from Ender Pearl and Blaze Powder.
Combine an Ender Pearl with Blaze Powder. Thrown into the air, it flies toward the nearest stronghold and then drops or breaks, so bring several. Twelve frames need filling in the portal room, minus the eyes already in place.
Ender Pearl + Blaze Powder → Eye of Ender
// Slots with several items cycle through every accepted option.
Combine 1 Ender Pearl and 1 Blaze Powder in any crafting grid to get 1 Eye of Ender.
At the Crafting Table: 1 × Ender Pearl and 1 × Blaze Powder give 1 × Eye of Ender.
It finds strongholds and activates the End portal. It is an ingredient in 2 recipes, made at the Crafting Table; for example End Crystal and Ender Chest. Used with: End Portal Frame. Leads to: Stronghold.