When to use the prop property of form-item in elementUi

look at the official document is written like this

clipboard.png
should I write if I don"t verify the form? Or is there a part of the check in a form, but do you need to write this property for the part that does not have a check?

<dialog-form :model="specForm" ref="specForm">
          <el-row :gutter="16">
            <el-col :span="16">
              <el-form-item prop="spec_name" :rules="formRules.checkRqInput" label="" label-width="120px">
                <el-input type="text" v-model="specForm.spec_name"></el-input>
              </el-form-item>
              <el-form-item label="" label-width="120px">
                <el-switch  prop="is_show" type="text" v-model="specForm.is_show" :active-value="1" :inactive-value="0"></el-switch>
              </el-form-item>
              <el-form-item prop="spec_values" label="" v-model="specForm.spec_values" label-width="120px">
                <el-tag
                  color="-sharp1AB394"
                  :key="tag"
                  type="success"
                  v-for="tag in dynamicTags"
                  closable
                  :disable-transitions="false"
                  @close="handleClose(tag)">
                  {{tag}}
                </el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="inputVisible"
                  v-model="inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm"
                  @blur="handleInputConfirm">
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput">+ </el-button>
              </el-form-item>
              <el-form-item label="" label-width="120px">
                <el-input type="textarea" v-model="specForm.description" rows="3"></el-input>
              </el-form-item>
            </el-col>
          </el-row>
        </dialog-form>

it"s like describing description. I don"t have to check here, don"t I have to write prop?

Mar.10,2021

unfilled _ (: blank) _

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