How can I download video from internet?

The procedure is really simple and you can download the songs from various websites. You just have to download software and I am sure you will be able to download the videos. First of I would like to tell you about software. If you are using Mozilla Firefox, then you have to go to settings and download YouTube downloader software from there. I will automatically show the icon on video you want to download but there is one problem with the software that it will only download YouTube videos for you. Now if you want to download songs from any random site, then you must download IDM ( internet download manager). The software is really cool and I personally use the software. The icon of IDM will be shown to any video you will open, you just have to click on it and your video will be downloaded. Thanks