End Portals (or End Portal frames) are generated naturally in strongholds, and in extremely rare chances, some or all of the portal won't span. Several strongholds generate throughout a world. If completed with eyes of ender, a sound plays:block.end_portal.spawn. This is a global sound. This allows players to travel to The End, and is needed to complete the game's canonical story.
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There are 2 portals you can craft in Minecraft. The Nether Portal and The End Portal.
You have to put 12 eyes of ender in each of the portal blocks. Then, it should activate.
You have to find an End-Portal in a stronghold. The probablility of finding a stronghold with an End-Portal in it is small. Because there are 3 strongholds per map, and there is 1 end-portal per game.
The End dimension can be left if the Ender Dragon is killed, and a portal is created, or if you die.
You shouldn't be able to, first off. But if you somehow smashed bedrock and all the portal blocks, you have to die to leave the End.