WHMCS themes allow hosting companies to customize the client area and admin interface to match their brand identity.
Pre-built themes are readily available and can be quickly deployed, whereas custom themes offer greater flexibility and uniqueness but require more development work.
WHMCS modules are plugins that extend the core functionality of WHMCS, enabling businesses to add new features or improve existing ones.
Modules can automate various tasks such as billing, provisioning, and customer management, which can save time and reduce errors.
Opt for themes and modules that are actively supported and regularly updated to keep up with WHMCS updates and security patches.