"data URL" meaning in English

{
  "etymology_text": ": data URL < → δείτε τις λέξεις data και URL",
  "forms": [
    {
      "form": "data URL"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "HTML (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "(HTML) όρος που αντικαθιστά τον: data URI"
      ],
      "id": "el-data_URL-en-noun-2cdbs7bu"
    }
  ],
  "synonyms": [
    {
      "word": "data URI"
    },
    {
      "word": "data URL scheme"
    }
  ],
  "word": "data URL"
}

{
  "etymology_text": ": data URL < → δείτε τις λέξεις data και URL",
  "forms": [
    {
      "form": "data URL"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "HTML (αγγλικά)"
      ],
      "glosses": [
        "(HTML) όρος που αντικαθιστά τον: data URI"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "data URI"
    },
    {
      "word": "data URL scheme"
    }
  ],
  "word": "data URL"
}