I dont know what we called this thing until my husband said, its a shopping cart honey...haha
Ok, lets talk about shopping cart.Its a tool where you install in your website and customer can view what is your items and buy from the website directly using the shopping cart.
Why do you need this?Because its easy and worth to buy the ready made tool rather than you build/develop your own.Usually when you buy the tool, it comes with a support services which will serve you for a certain period of time. If you want to have is customized and all, you can just email them and they will charge a little bit amount for that.
They are few famous shopping cart in the market. If I Google, I can found the top ranking is http://www.zen-cart.com/. They are so many more in the website and you can choose based on your preferences.
We ( my husband and I) bought a tool in VP-ASP Shopping Cart and now its been applied to our www.kahwin.net website. Soon, we gonna apply to all our online business website.It means, when you buy one, you can use for all business you have. But still they got a free download application and there is a limit in the features.
You can always email the customer service if you dont know how to setup the shopping cart and they will help you straight away.
I hope this entry will help you understand what is shopping cart all about. Just drop a comment if you have any queries...