Hydrogen is the first element in the periodic table. It is the lightest element with atomic number 1 and symbol H. It is very abundant element, found in the universe, in the space between stars, and off course on the earth.
It is part of water. One molecule of water has 2 atoms of hydrogen.
The video in this post explains about fundamentals of hydrogen. This channel in you tube is a great one, I found. Very useful, educative to layman. The periodic Table of video has videos of all elements. In the video, they show some demonstration to better understand the element and an old man, looks scientist talks about the importance of the element. I don't know his name though.