CentOS is a Linux operating system or Linux distribution which is open source versions of the Red Hat Enterprise Linux or RHEL. CentOS is 100% compatible with the RHEL and most of the packages of the RHE provided by CentOS.
CentOS Release History
CentOS version numbers start from 3 where it was the clone of the RHEL 3.
- `CentOS 3`is released on 19 March 2004.
- `CentOS 4`is released on 9 March 2005.
- `CentOS 5`is released on 12 April 2007.
- `CentOS 6`is released on 10 July 2011.
- `CentOS 7`is released on 7 July 2014.
- `CentOS 8`is released on 24 September 2019.
CentOS Download Mirrors
CentOS is a very popular project which is supported by a lot of different organizations. In order to make the download faster and ease a load of main CentOS servers, mirrors are used around the world. These supporting organizations like universities, companies, persons, ISPs, etc creates a mirror to download CentOS images. We can list the images according to the location, region or sponsor from the following link.
https://www.centos.org/download/mirrors/

Alternatively, we can also list mirrors according to the CentOS versions from the following link.

CentOS ISO/DVD Versions and Download Links
CentOS project provides different flavors of the CentOS Linux distribution for different use cases. Let’s examine the CentOS ISO download versions.
CPU Architecture
The server, PC or system architecture which should be selected properly. x86_64
is the most used and popular CPU architecture which is most downloaded for regular PCs, servers, laptops, workstations, etc.
http://mirror.centos.org/centos-8/8/isos/

x86_64
http://mirror.centos.org/centos-8/8/isos/x86_64/
aarch64
http://mirror.centos.org/centos-8/8/isos/aarch64/
ppc64le
http://mirror.centos.org/centos-8/8/isos/ppc64le/
DVD/ISO Size and Installation Method
CentOS DVD or image ISO can be download for different flavors before CentOS 8. With the CentOS 8, two main versions are provided where they can be customized for different desktop environments or installation.
Netinstall or Boot ISO
Netinstall only contains basic packages in order to download and install CentOS’s latest packages.
http://mirror.netdirekt.com.tr/centos/8.1.1911/isos/x86_64/CentOS-8.1.1911-x86_64-boot.iso
Alternatively, we can use Torrent in order to download the netinstall or boot iso.
http://mirror.netdirekt.com.tr/centos/8.1.1911/isos/x86_64/CentOS-8.1.1911-x86_64-boot.torrent
Live DVD or Installation DVD
We can use Live DVD or Installation DVD from a single ISO image which is provided with the following links.
http://mirror.netdirekt.com.tr/centos/8.1.1911/isos/x86_64/CentOS-8.1.1911-x86_64-dvd1.iso
http://mirror.netdirekt.com.tr/centos/8.1.1911/isos/x86_64/CentOS-8.1.1911-x86_64-dvd1.torrent