
Originally Posted by
RodG
Too expand on DrBytes reply.
The Sessions are what enables a website to maintain 'state' - or simply put, it keeps track of users access as they move from page to page and/or add products to their cart. Almost all websites use Sessions (of one form or another). Cookies can be used for similar purposes. The main difference being that Sessions are stored on the server, Cookies are stored on the customers computer.
Do you want spiders to start a Session. No. It doesn't provide any benefits, and rogue spiders (and even some good ones) will start adding 100's or 1000's of products to their Session/cart as they crawl the site. Something that you really don't want.
Cheers
RodG