What makes a bootloader locked or unlocked? - Android Q&A, Help & Troubleshooting

Hi,
I was just wondering what makes a bootloader locked or unlocked. I know what bootloader unlocking is, but what actually changes in phone to make it stop checking boot, recovery and other partitions? And how do it knows if a partition is stock or not?
Thanks.

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[Q] How to Lock Bootloader After Unlocking Bootloader

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Bump! I need the answer too.

[Q] Benifits of unlocked BL?

As you may of noticed, (Possibly not) I've unlocked my tablet's bootloader, but, what are the benefits of having a unlocked bootloader? I only know is more ROM support.
MinerBoy004 said:
As you may of noticed, (Possibly not) I've unlocked my tablet's bootloader, but, what are the benefits of having a unlocked bootloader? I only know is more ROM support.
Click to expand...
Click to collapse
Enhanced recovery capabilities as you can repair damaged system components (eg: borked recovery partition) from fastboot.

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I have a question regarding locking the bootloader, but I'm not sure if it's entirely possible.
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