The main difference is Laptops or PCs are designed to create the data, where as Netbooks are designed to access the data.
Netbooks are suitable only to create a little amount of data like Powerpoint presentations, spread sheets and documents.
Netbooks are mainly used for Web browsing.
We can install and use big applications like photoshop, but netbook will run slowly comparing to Laptops and PCs.
Battery Backup is more in Netbooks compared to PCs and Laptops due to its small screen size, Flash Hard Disks and lowest clock speed processors.
Netbooks are not alternative for Laptops and PCs. Netbooks are completely designed to work with small applications with more time.
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