Hey friends,
Can anyone help me to understand the exact meaning and use of the following...

What is the difference between
<meta name="description" content=""> and
<meta name="keywords" content=" ">
Here I assume that I should write important Keywords from my site in <meta name="keywords" content=" ">..

but what is the other one?? what should I write in description.. ??
Is there any limit of keywords to enter in keyword content???
AND
what is this for ???
<META NAME="OWNER" CONTENT="">....??
<META NAME="AUTHOR" CONTENT="">.... ??
What should I write in above contents???
and What is keyword spamming??? Google says that they object it and will disqualify the site ... what does that mean???
Plz help me understand all this..

thanks...
- Sonya