How code works

Question

Hi

  In a form i have below code . How it works . What does this line mean

<app-file-uploader formControlName="fileUpload"></app-file-upload>

<div class="row">
                <div class="col-xl-12">
                  <label>Upload</label>
                  <app-file-uploader formControlName="fileUpload"></app-file-upload>
                </div>
              </div>

Thanks