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Ubuntu, Red Hat Enterprise Linux (RHEL), and Oracle Linux are all Linux operating systems. They are open-source operating systems, which means that their source code is available to the public and can be freely modified and distributed.

Here are some key differences between these three Linux distributions:

1. Development and support: Ubuntu is developed and maintained by Canonical, a company based in the UK. Red Hat Enterprise Linux is developed and maintained by Red Hat, Inc., a US-based company. Oracle Linux is developed and maintained by Oracle Corporation, a US-based company.
2. Package management: Ubuntu uses the apt package manager, which is a command-line tool that allows you to install, update, and remove software packages. Red Hat Enterprise Linux uses the yum package manager, which is also a command-line tool for managing packages. Oracle Linux uses the yum package manager as well.
3. Target audience: Ubuntu is targeted at general users and is suitable for a wide range of applications, including desktop, server, and cloud environments. Red Hat Enterprise Linux is targeted at enterprise users and is commonly used in enterprise environments, such as server farms and cloud environments. Oracle Linux is also targeted at enterprise users and is optimized for running Oracle database applications.
4. License: Ubuntu is released under the GNU General Public License (GPL), which allows users to modify and distribute the source code. Red Hat Enterprise Linux is released under a proprietary license and is not available for modification or redistribution. Oracle Linux is also released under a proprietary license and is not available for modification or redistribution.

Overall, the main difference between these three Linux distributions is their target audience and the types of applications they are optimized for. Ubuntu is suitable for general users, Red Hat Enterprise Linux is geared towards enterprise users, and Oracle Linux is optimized for running Oracle applications.