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Obtaining our CentOS installation media
The main way Linux distributions are distributed is in the form of ISO images. These images can then be burned onto a DVD as appropriate, or mounted for a VM to boot from.
Head over to https://centos.org/download/ and have a look at the options on offer.
I'm going to download the Minimal ISO, for reasons that will become clear shortly.
Clicking through should bring you to a mirror page:
This is a bandwidth-saving measure on part of the CentOS Project by prompting the end user to download from any number of different hosts. They can spread the cost of bandwidth out to volunteers.
What you tend to find is that these providers typically fall into two categories, with exceptions. Generally, the images are provided by universities, or hosting providers. The cynic in me thinks that the hosting providers offer a mirror service as an easy source of marketing, rather than some philanthropic gesture.
Choose a download location near to you, and wait for the download to complete.
You may note that one of the download options is via Torrent. Torrenting is a great way of spreading out the cost of bandwidth to multiple people, and allowing a small piece of the software to be downloaded from multiple locations greatly reduces load on any one source. However, it should be noted that some workplaces watch out for this type of traffic on their networks due to the reputation torrenting has.