What are the different recruitment processes for different grades of employee?

what are the different recruitment processes for different grades of employee .How a organization will source the candidates .what will be its process.
I request you to provide me with the examples if you can , so that it will be helpful to me in presenting in my internship project.

Dear Ashwini,
My sincere advice to students like you is kindly search the web and write the answer to your questions and then seek help in correcting any mistakes that you may have made. You learn more that way rather than if people give you answers on-a-plate.
As you have not given details of the organisation, it would be difficult to give precise answers. For example access https://www.nao.org.uk/wp-content/up...ethodology.pdf to see how civil servants are recruited in the UK.