The internet is full of videos that everyone would love to watch. You are not only able to watch but also be able to download them to your devices. Not every website where you can find videos would allow you to download them.
See YouTube for example, which has millions of videos uploaded by different publishers. But not a single one of them would allow you to download them because of the way different platforms are designed to work. It is however possible for you to obtain certain videos from specific websites and download them to your own devices.
The thing is different websites work differently and if you refer to a website that explicitly publishes downloadable videos then you will be able to obtain them without having to worry too much about its permissibility.
There are a few things however that you will have to be careful about before downloading videos off the internet.
Firstly, make sure the website that offers you videos to download is actually reliable. This is because it is indeed possible that many videos may not actually be what they claim to be. Instead, they might contain malware that could disrupt your system.
In order to safeguard yourself from malware, you should only proceed through websites that can be trusted for videos that they publish and allow their visitors to download. Check out Länkkatalog for some useful resources.