I am new at all of this but very eager to learn, so forgive me for such a dumb sounding question. I keep hearing about how about important link sharing is and that it's not uncommon for successful sites to have hundreds and hundreds of links pointing to and from their site. My question is where are these links, I shop at ecommerce sites all the time and never see all these hundreds of links. Where are they, in the code? I don't see them while I'm shopping. Thanks.