Garima is right, as recruitment is the process of attracting a pool of candidates towards a job, whereas selection is the process of choosing the best and most suitable person from that pool of candidates. Moreover, selection is a two-way process. For example, it's not that organizations select candidates, but candidates also select the organization in which they are going to work in the future (either they will find themselves fit or not). Therefore, it's a two-way process!
For any further queries, you are more than welcome!
Regards,
Saad Masood.