fetch() explain principle and what happing behind [closed]

can someone explain this line of code to me when we want to use fetch() some data to firebase? we are trying to get some data from users in the form and then sending them to the firebase servers instead of the browser database directly actually is part of the youtube practice course, not my project I am very new to whole web developer things

Blockquote

irect to data

   fetch(
  "https://training-for-react-default-rtdb.firebaseio.com/meetups.json",
  {
    method: "POST",
    body: JSON.stringify(meetupData),
    headers: {
      "content-type": "appLication/json",
    },
  }

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