Youtube.com
This website is very popular and is the best place to search for anything if you are looking for a video. You will find almost everything from music, recipes and informational videos etc. on this website. You can even find old series video like tehkikaat, byomkesh bakshi etc.
You can also create your own videos and upload and share it with other users and friends.Downloading is free except for copyrighted videos. They have a term called channel to which you can subscribe to get updates.
However to stream videos online, you will need a good internet connection. Many of you might not know that you can play snake game while the videos are buffering. Its very user friendly and my first preference to find any information.
Regards,
R