Chromebook laptops are using Chrome OS as operating system, which is more similar to Android than to Microsoft Windows. They can be described as cheaper alternatives to Windows laptops. Chromebooks with Parallels Desktop Client software should allow to run Windows and its applications.
Chromebooks are good enough mainly for web browsing and standard office work, but their strengths are battery life and easy to use environment. To fully use Chromebook laptop, it is required to have an internet connection, but laptop can also work offline.
Some Chomebooks have comparable hardware to Windows laptops. Because of their solid CPUs and amount of RAM memory, they can provide a good performance. It is even possible to replace Chrome OS with Windows on some Chromebook laptops, but overall installation process may be a bit complicated to do.