Are you allowed to use any pictures and videos that you downloaded from the Internet freely?

What will be an ideal response?

No, when you access photos from public sites, such as Flickr or Bing Image Search, most of them are subject to the Creative Commons licensing, which means that usually you can use the images for free only if it is for personal use. It is very important that users review the specific license for any image to ensure that they comply with the copyright guidelines.