What is the difference between the options 'domains' and 'provider'?

[ghost]

Let me ask you a question.
I'm trying to adopt nuxt/image with Nuxt3 and Contentful. I learned that setting providers is necessary to get remote images from the CMS's server, but what is the difference between domains, provider, and baseURL?

Tell me which part of the code below is duplicated?

export default defineNuxtConfig({
  modules:["@nuxt/image"],
  image: {
    domains: ['images.ctfassets.net'],
    contentful: {
      baseURL: 'https://images.ctfassets.net'
    },
  },
});

<div class="wrapper">
  <NuxtImg provider="contentful" format="webp" :src="hoge.file.url"/>
</div>