I am considering learning to program in PHP and mySQL and i was wondering if some body could answer my questions.

What is PHP?
What is mySQL?
Can i create .txt files?
Can i edit .txt files?
Where can i download the latest Apache server? (A link directly to the file would be nice)
When a webpage has PHP instead of HTML, what does that mean?
Can i create a web page in PHP?
What are the best tutorials for learning them together?

Quite a newbie list of questions but we all gota start some were, also if there is anything else that i should know dont forget to put it in your post.

Cheers