Azure Active Directory (AD) B2C is a highly available and global identity management service for your customer-facing applications, that easily integrates across mobile and web platforms and scales to hundreds of millions of identities. Enable your customers and consumers to log on to your applications through fully customizable experiences, whether they use an existing social account or create new credentials. With Azure AD B2C, you can:

• Protect your customers' identities
• Enable login with social media identities
• Customize user experiences
• Pay only for what you use on a per-Monthly Active User (MAU) basis

Multi-Factor Authentication (MFA) activity is billed separately and is not included in the free tier.