how to form submission work with route link in laravel 5.6

I am following a tutorials with laravel 5.6 and dropzone box for uploading images. this is my form,

<form method="post" action=""
                  enctype="multipart/form-data" class="dropzone" id="my-dropzone">
                
                <div class="dz-message">
                    <div class="col-xs-8">
                        <div class="message">
                            <p>Drop files here or Click to Upload</p>
                        </div>
                    </div>
                </div>
                <div class="fallback">
                    <input type="file" name="file" multiple>
                </div>
            </form>

//submission link
<a class="navbar-brand" href="">Upload</a>

and My routes is like this,

Route::get('/', 'UploadImagesController@create');
Route::post('/images-save', 'UploadImagesController@store');

any way above codes working well but I can't understand how this submission link work with routes, can you anybody describe how works this link with above routes.

via Chebli Mohamed