How is remoteEntry.js created in module federation/micro frontend?

I'm reading up on module federation/ MFE and it all seems to make sense besides the remoteEntry.js file.

So if I understand this correctly, my MFE:

• Creates a remoteEntry.js file which my host then looks for and that is how the code is integrated to my host app? Basically all my MFE code is complied into this js file?
• How is remoteEntry.js created? I can't see it in my MFE's file directory.
• Do I need to 'rebuild' my MFE every time I want to make a change and see it on my host app?

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