I want to know the difference between dnf and yum

dnf and yum are both package managers used on RPM-based Linux distributions (like Fedora, RHEL, CentOS, etc.), but there are some important differences between them.

1. DNF (Dandified YUM)

• Replacement for YUM: dnf is the next-generation version of yum, introduced as the default package manager in Fedora 22 and later. RHEL 8 and CentOS 8 also use dnf by default.
• Performance: dnf is faster than yum because it uses a more efficient dependency resolution algorithm and leverages parallel downloading.
• API and Python3: dnf is written in Python 3, whereas yum is written in Python 2. This means dnf has better long-term support and improved APIs for developers.
• Better Dependency Management: dnf uses a more accurate dependency resolver, which leads to fewer problems with package dependencies.
• Backward Compatibility: dnf is mostly backward-compatible with yum, meaning you can often use dnf in place of yum commands.

2. YUM (Yellowdog Updater, Modified)

• Older Version: yum is the older package manager that was used in RHEL/CentOS 7 and older Fedora versions. It has been around since 2003.
• Performance: yum is slower compared to dnf due to its older dependency resolver and lack of parallel downloading.
• Written in Python 2: Since it's based on Python 2, yum is now considered outdated, and Python 2 itself has been officially deprecated.
• Feature Set: yum is feature-rich but lacks some of the newer optimizations and improvements found in dnf.

Summary of Key Differences:

• Speed: dnf is faster and more efficient.
• Dependency Resolution: dnf has better handling of dependencies.
• Language: dnf is based on Python 3, while yum is based on Python 2.
• Default: dnf is now the default in modern distributions (Fedora 22+, RHEL 8+, CentOS 8+).

In short, dnf is the future of package management on RPM-based systems, and while yum is still supported in some older systems, dnf is the one to use if you're on a newer version of a distribution.