Freedom of speech is something that is considered god given along with freedom of free will. And this is exemplified in the internet in form of tube videos. These videos are named because most of such clips are found in the database of youtube. Hence the suffix of the site now characterizes these clips. These clips can be of any type. They can be funny video clip to promote a humor channel or instructional martial arts video clips to help you learn something that might come in practical use in real life. These clips are uploaded from all corners of the world and sometimes may even contain explicit content such sexy utube video. 

Therefore viewer discretion is advised although many sites that host streaming clips clearly signify or state so in case of adult clips. Also viewing the clips online in a streaming format reduces your risk of virus attacks on the computer as the information is not stored directly on the computer and the temporary file that is used to store the temporary embedded player information is deleted almost as instantly as you close your browser down. 

You can even watch your favorite tv shows on these sites. Some sites allow the option of downloading these online videos but they are at the complete risk of the user. The site is not in anyways responsible for the consequences on the user for the download of these videos. Therefore it is best to watch these videos streamed online.