Squidoo is a website that lets users create pages, which are called lenses, for subjects that are of interest to them. The lenses that are generated by users are very similar to blog posts. Just as each blog post is usually on a particular subject, each lens or page on Squidoo is about one thing. Users can create as many lens as they can create. In addition, Squidoo allows lens creators to earn money from referral links to sites such Amazon.com and Ebay.
Sites such as Squidoo and HubPages provide a means to create a presense on the Web by linking pages to your website. This is called a Link Wheel. When you build a Link Wheels you create multiple articles designed to drive traffic to your main website. Building links to your site helps to move you up in the search engines. This video by gravtex explains the nuts and bolts of the Link Wheel.
You can make money with Squidoo and Hubpages even if you don't have your own website. Each site offers ads that when clicked on make both you and them money. Check ou these videos to get an idea of you can make monety with these sites.