Bulk keywords is useful for website?

[willy66]

currently i saw a lot of website using tag or related function to add in bulk keyword to their site with unrelated keyword? will it useful? why they do like this? there have tons of keywords if you click in

for e.g

http://www.aliexpress.com/product.html

there have tons of keywords if you click in

Please give some suggestion if this way useful?

[willy66]

anyone can give suggestion?

[willy66]

anyone can give some suggestion as this is quite urgent for me, thanks

[willy66]

anyone can give some suggestion?