You might notice that when you have been browsing a website looking for something, (for example, a pair of shoes), then you will start to see ads for those shoes when you're browsing the internet. The reason this happens is the cookies on your computer. Alternatively, you clicked 'yes' when you got asked if you wanted the website to remember your username and password.
SkimLinks works very similarly to VigLinks in that it is designed for bloggers who don’t want to do a lot of hands-on work to participate in an affiliate program. SkimLinks also works much like VigLinks in that it uses a plugin or script to create dynamic links in your content to send visitors to higher paying offers from merchants. SkimLinks claims to work with over 24,000 merchants/advertisers.