I have submit my site on google search engine but they have not listed it yet. I have checked it many time. And I am having hits from Mediapartners-Google/2.1, what do this mean and what it suppose to do, when my website have'nt get listed.
Yes, I also want to know about crawler can any body tell me what they are and how they are usefull for websites.
Crawlers automatically go through your websites Meta info and pick out the most relevant descriptions and keywords and many other things they see and they index your site with all the keywords and meta descriptions you have inputed this in turn makes it easier for search engines to pick through the trillions of websites out there and pick the most relevant website for that position hope this helps contact me if you have any questions!