Azure Active Directory Domain Services (AD DS) offers managed domain services such as
- Domain Joining
- Group Policy
- LDAP
- Kerberos/NTLM Authentication
ADDS helps you to use domain services without you deploying / managing it.
Refer: https://learn.microsoft.com/en-us/azure/active-directory-domain-services/overview
With Intune, you can control how your organization devices are used including mobile, tablets and laptops. Intune is part of Microsoft's Enterprise Mobility + Security (EMS) suite. Intune integrates with Azure Active Directory (Azure AD) to control who has access and what they can access.
Refer: https://learn.microsoft.com/en-us/mem/intune/fundamentals/what-is-intune
I recommend you to refer the following video to understand the difference between Azure AD and Intune.
https://www.youtube.com/watch?v=PBaFpCq2x9A
Hope this helps