What is the domain parking concept in the web hosting?
How to part a domain?
What is Domain Parking? Which hosting companies are providing the domain parking services?
Suppose you have bought a domain and you still have taken the space for hosting the website.
Or simply your website is not ready then you can use you can user the domain parking service to display one page for your website.
So, domain parking service allows you to display one page without having the hosting space.
Check the tutorial What is Domain Parking.