cPanel is a web-based control panel that allows users to manage hosting services such as websites, email, passwords, files, and more. WHM (Web Host Manager) is an administrative tool for managing cPanel accounts that allows resellers to create, modify, and monitor multiple hosting accounts. WHM functions on port 2087 and shares passwords with cPanel accounts, while cPanel operates on port 2083 and allows independent password changes.

2.  cPanel is a web-based control panel that assists users in managing Linux hosting
services. A user can use cPanel to manage administrative hosting tasks such as
creating a website, creating and managing emails, resetting passwords, setting
mail forwards, managing add-on domains and subdomains, uploading and
managing files, and so on.

3.  WHM (Web Host Manager) is an administrative access tool for the cPanel
account's backend. WHM allows you to create a cPanel account to access hosting
accounts. WHM allows users to easily manage a variety of light to heavy sites.
Furthermore, one can sell hosting services and manage multiple cPanel accounts
with the ability to modify, upgrade, or even downgrade an account, as well as
monitor bandwidth usage.

4. cPanel
1. Controller
 WHM is a control panel for resellers. Resellers use it to
manage all of the hosting accounts associated with their
reseller plans.
2. Access
 WHM grants resellers root-level access.
3.Port Number
 WHM functions via 2087, a secure port number.
4. Password reset
WHM's password is the same as that of its cPanel account.
For example, if you change your WHM password, your cPanel
password will also change.
5. Domains
One can only add domains and not subdomains.
WHM
1. Controller
 The control panel used by end users under a reseller of a
hosting provider is known as cPanel. Customers use it to
manage their own hosting accounts.
2. Access
 Users can only access their web hosting accounts on the
server via cPanel.
3. Port Number
 cPanel on the other hand functions via 2083 as its secure port
number.
4. Password reset
The password for cPanel can be changed at any time by the end
user.
5. Domains
Adding and removing add-on domains and subdomains is
possible.