Feras, I am confused about what you are asking. Do you want to know what a database is? Or are you interested on how a they work, what software you use to create them, etc? There are a lot of questions that can be asked about your question. If you would please flesh out what you are looking for that would be a big help.
LEARN BY DOING NOT BY FOLLOWING DIRECTIONS!
I thought you were a hispanic/african american? Who is the white guy in the pictures?